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El film muestra la dedicaci\u00f3n y [...]","link":"http://vodpod.com/watch/2831998-documental-hard-problems-the-road-to-the-worlds-toughest-math-contest","autoplay_embed_tag":"<embed src=\"http://www.youtube.com/v/k5e2sWeD_iU&autoplay=1&fs=1&showinfo=0&showsearch=0&rel=0&#038;rel=1&#038;fs=1&#038;showsearch=0&#038;hd=0\" type=\"application/x-shockwave-flash\" allowscriptaccess=\"always\" allowfullscreen=\"true\" wmode=\"opaque\" width=\"100%\" height=\"100%\" id=\"myytplayer\"></embed>","stats":{"total_pod_views":14,"total_views":18,"total_widget_views":4,"weekly_pod_views":3,"weekly_views":4,"weekly_widget_views":1},"uid":"7b20d0fd376a677860fae64d308bdbe2643535d5","created_at":"Sat, 09 Jan 2010 08:28:51 -0600","pod_id":1729,"user":{"link":"/carlostorres","user_id":1855,"_value":"Carlos Torres","username":"carlostorres"},"vodpod_id":2831998,"original_url":"http://edumate.wordpress.com/2010/01/09/documental-hard-problems-the-road-to-the-worlds-toughest-math-contest/","num_collectors":1,"title":"Documental \u201cHard Problems: the road to the world\u2019s toughest math contest\u201d"}},{"video":{"embed_host":"youtube.com","updated_at":"Fri, 20 Nov 2009 18:50:37 -0600","video_id":3972789,"embed_tag":"<embed src=\"http://www.youtube.com/v/cy-8lPVKLIo&autoplay=&fs=1&showinfo=0&showsearch=0&rel=0&#038;rel=1&#038;fs=1&#038;showsearch=0&#038;hd=0\" type=\"application/x-shockwave-flash\" allowscriptaccess=\"always\" allowfullscreen=\"true\" wmode=\"opaque\" width=\"100%\" height=\"100%\" id=\"myytplayer\"></embed>","thumbnails":{"small":"http://img.vpimg.net/2548907.jpg","large":"http://img.vpimg.net/2548907.large.jpg","assigned":false,"medium":"http://img.vpimg.net/2548907.medium160.jpg"},"description":"Interesante animaci\u00f3n sobre la historia de los n\u00fameros.\nDisfuten!\n\n\u00a0\n\n\u00a0\n\n\nPost al azar\n\n\u00bfQuieres leer un post al azar? Clic en los dados\u2026\n\n\nSi te agrad\u00f3 esta entrada Com\u00e9ntalo y no olvides suscribirte a este blog para recibir las noticias,cada vez que se publiquen, directamente en tu correo. Para ello, s\u00f3lo tienes que ingresar a   SUSCRIBIRSE !! y [...]","link":"http://vodpod.com/watch/2548907-video-animado-sobre-el-desarrollo-de-los-nmeros-en-ingls","autoplay_embed_tag":"<embed src=\"http://www.youtube.com/v/cy-8lPVKLIo&autoplay=1&fs=1&showinfo=0&showsearch=0&rel=0&#038;rel=1&#038;fs=1&#038;showsearch=0&#038;hd=0\" type=\"application/x-shockwave-flash\" allowscriptaccess=\"always\" allowfullscreen=\"true\" wmode=\"opaque\" width=\"100%\" height=\"100%\" id=\"myytplayer\"></embed>","stats":{"total_pod_views":126,"total_views":141,"total_widget_views":15,"weekly_pod_views":12,"weekly_views":13,"weekly_widget_views":1},"uid":"5568576fd69ad358ad2c0439f85c439f0cbf58e9","created_at":"Fri, 20 Nov 2009 18:50:37 -0600","pod_id":1729,"user":{"link":"/carlostorres","user_id":1855,"_value":"Carlos Torres","username":"carlostorres"},"vodpod_id":2548907,"original_url":"http://edumate.wordpress.com/2009/11/20/video-animado-sobre-el-desarrollo-de-los-numeros-en-ingles/","num_collectors":1,"title":"Video animado sobre el desarrollo de los n\u00fameros (en ingl\u00e9s)"}}],"total":95}});
  
  widget4116776309.innerHTML += '<div class="vodpod_placeholder_bottom"></div>';
  widget4116776309.innerHTML += '<img src="http://stats.vodpod.com/stats/widget/1729/blank.gif?' + parseInt(Math.random()*9999999) +
    '&page=' + encodeURIComponent(document.location) +
    '" style="width:0px;height:0px;padding:0px;margin:0px;"/>';
  
  // Set custom widget color
  widget_header = ''
  
  
  widget4116776309.style.display = 'block';
}

function createInfoBox4116776309() {
  var img = document.createElement('img');
  img.id = 'popup_image_4116776309';
  img.style.position = 'absolute';
  img.style.bottom = '10px';
  img.style.left = '7px';
  img.style.zIndex = '1000';
  
  var container = document.createElement('div');
  container.id = 'popup_container_4116776309';
  container.className = 'vodpod_popup_container';
  container.style.position = 'absolute';
  container.style.bottom = '20px';
  container.style.left = '20px';
  container.style.width = '136px';
  container.style.height = '230px'; //250
  container.style.zIndex = '1001';
  
  var html = "<p>This widget powered by <a href='http://vodpod.com'>Vodpod.com</a>.</p>";
  html += "<div style=\"text-align:center !important\"><a href=\"#\" onclick=\"vp_getCode(); return false\"><img src=\"http://assetscdn.vodpod.com/images/widget/get_this_code.gif\" /></div>";
  html += "<br /><br /><p><a href='http://vodpod.com/site/register?r=widgetinfo'>Sign up</a> to Build your own video collection and put a ";
  html += "Vodpod on your blog, website, Facebook, Myspace.</p>";

  html += "<div style='text-align:center !important;position:absolute;bottom:10px;left:0;width:100%;'>";
  html +=   "<img src='http://assetscdn.vodpod.com/images/widget/close_button_white.png' style='cursor:pointer' onclick='closeInfoBox4116776309()'>";
  html += "</div>"
  
  container.innerHTML = html;
  
  var header = document.createElement('div');
  header.id = 'popup_header_4116776309';
  header.style.position = 'absolute';
  header.style.bottom = '265px';
  header.style.left = '48px';
  header.style.width = '110px';
  header.style.height = '23px';
  header.style.lineHeight = '23px';
  header.style.fontSize = '12px';
  header.style.zIndex = '1001';
  
  header.innerHTML = "Widget Info"

  img.onload = function() {
    document.getElementById(vp_widget_id).appendChild(header);
    document.getElementById(vp_widget_id).appendChild(container);
  }
  img.src = "http://assetscdn.vodpod.com/images/widget/info_popup.png";

  
  document.getElementById(vp_widget_id).appendChild(img);
  
  // We actually only need Prototype for viewport dimension functions for the code lightbox. We could copy those inline.
  var proto_scr = document.createElement("script");
  proto_scr.src = 'http://ajax.googleapis.com/ajax/libs/prototype/1.6.0.3/prototype.js';
  document.body.appendChild(proto_scr);
}

function closeInfoBox4116776309() {
  var image = document.getElementById('popup_image_4116776309');
  var container = document.getElementById('popup_container_4116776309');
  var header = document.getElementById('popup_header_4116776309');
  
  image.parentNode.removeChild(image);
  container.parentNode.removeChild(container);
  header.parentNode.removeChild(header);
}

// function vp_createVideo(id, embed, title, descrp, thumbnail, views, date, hostname, url, num_collectors) {
  // html = vp_createVideo(video.video_id, video.autoplay_embed_tag, video.title, video.description, thumbnail, video.stats.total_views, video.created_at, video.embed_host, video.original_url, video.num_collectors);
  
function vp_createVideo(video) {
  vp_videos[video.video_id] = video;
  date_match = video.created_at.match(/(\d{1,2} \w{3,4}) \d*?(\d{2})\b/);
  video.date = date_match[1] + " " + date_match[2];
  var views_label = video.stats.total_views == '0' ? '' :  '<span class="vodpod_video_views_num">' + video.stats.total_views + '</span> <span class="vodpod_video_views_label">views</span>';
  // vp_videos[id]['num_collectors'] = num_collectors;
  video.thumbnail = video.thumbnails.medium;
  video.thumbnail_html = '<div class="vodpod_video" id="vodpod_video_' + video.video_id + '" onmouseover="vp_videoMouseOver(this);" onmouseout="vp_videoMouseOut(this);" onclick="vp_loadVideo(' + video.video_id + ', ' + video.vodpod_id + ');return false;">\
    <a href="#" class="vodpod_video_thumbnail">\
      <img src="' + video.thumbnail + '" title="' + video.description.replace(/"/g,'') + '" />\
    </a>\
    <div class="vodpod_video_placeholder1"></div>\
    <img src="http://assetscdn.vodpod.com/images/widget/play_icon.png" class="vodpod_video_play_image vodpod_png" style="display:none;"/>\
    <img src="http://assetscdn.vodpod.com/images/black_trans_1px.png" class="vodpod_video_title_shading vodpod_png" style="display:none;"/>\
    <a href="#" class="vodpod_video_title" title="' + video.title.replace(/"/g,'') + '">\
      ' + video.title + ' \
    </a>\
    <div class="vodpod_video_views">' + views_label + '</div>\
    <div class="vodpod_video_created_at">' + video.date + '</div>\
    <div class="vodpod_video_placeholder2"></div>\
    <div class="vodpod_video_index" style="display:none;">' + (video.index < 10 ? '0' : '') + video.index + '</div>\
    <div id="vodpod_video_clear">\
    </div>\
  </div>';

  return video.thumbnail_html;
}

function vp_loadNextSet4116776309(direction) {
  page4116776309 += direction;
  url = 'http://api.vodpod.com/api/pod/videos.js?pod_id=1729&api_key=js_widget&callback=vp_loadJsonVideos4116776309&per_page=4&page=' + page4116776309 + '&category_id=latest';

  var json_script = document.createElement('script');
  json_script.src = url;
  document.body.appendChild(json_script);
}

function vp_loadJsonVideos4116776309(json) {
  video_container = vp_getElementsByClassName(widget4116776309, 'vodpod_video_container')[0]; //document.getElementById('vodpod_video_container_1729');
  video_container.innerHTML = '';
  per_page = 4;
  var next_node = document.getElementById('vodpod_paging_next');
  var prev_node = document.getElementById('vodpod_paging_prev');
  
  if (next_node != null) {
    if (json.videos.total > page4116776309*per_page) {
      next_node.className = 'active';
    } else {
      next_node.className = 'inactive';
    }
  }
  
  if (prev_node != null) {
    if (page4116776309 > 1) {
      prev_node.className = 'active';
    } else {
      prev_node.className = 'inactive';
    }
  }
  
  if (json.videos.items) {
    for(var i = 0; i < json.videos.items.length; i++) {
      var video = json.videos.items[i].video;
      video.index = i + 1 + (page4116776309 - 1) * per_page;
      html = vp_createVideo(video);
      
      video_container.innerHTML += html;
    }
  }
  
  vp_fixIePngs(widget4116776309);
}

function vp_loadVideo1(id) {
  // Clear the previous embed holder
  vp_closeVideo();

  var vid_html = vp_videos[id].autoplay_embed_tag
  var descrp = vp_videos[id].description;
  var date = vp_videos[id].date;
  var vodpod_video = document.getElementById('vodpod_video_' + id);
  var video_div = document.createElement('div');
  video_div.id = "vodpod_player_container";
  video_div.style.position = 'absolute';
  video_div.style.border = 'none';
  video_div.style.width = '402px';
  video_div.style.zIndex = '10000';
  var top = vp_offsetTop(vodpod_video);
  video_div.style.top = top + 'px';

  var els = vp_getElementsByClassName(widget4116776309, 'vodpod_video_placeholder1')
  for (i=0; i < els.length; i++) {
    els[i].style.opacity = 1;
  }
  
  //video_div.style.left = vp_offsetLeft(vodpod_video) + 'px';
  video_div.innerHTML = '<div style="background:url(http://assetscdn.vodpod.com/images/widget/player_top_402px.gif) no-repeat !important;height:3px;padding:0px !important;margin:0px !important;overflow:hidden;"></div>\
  <div style="cursor:move !important;height:28px;color:#fff;overflow:hidden;background:#606060 !important;width:402px;">\
      <img src="http://assetscdn.vodpod.com/images/widget/logo_16px.png" class="vodpod_png" style="float:left;margin-top:6px !important;margin-left:6px !important;margin-right:6px !important;"/>\
      <div style="float:left;width:260px;height:18px;overflow:hidden;padding-top:6px !important;margin:0px;font-size:13px;text-align:left;">\
        <a href="http://vodpod.com/pod/video/' + id + '" style="color:#fff;" title="View this video at Vodpod">' + vp_videos[id].title + '</a>\
      </div>\
      <a href="#" id="vp_close_img" onclick="vp_closeVideo();return false;" style="display:block;float:right;color:#fff;margin-top:6px !important;margin-left:0px !important;margin-right:4px !important;padding:0px !important;border:none !important">\
        <img src="http://assetscdn.vodpod.com/images/widget/close_large.png" style="border:none !important;margin:0px !important;padding:0px !important;"/>\
      </a>\
      <a href="#" title="Popout video to a new window (video will start over)" onclick="vp_popoutVideo(' + id + ');return false;" style="display:block;float:right;color:#fff;margin-top:6px !important;margin-left:2px !important;margin-right:2px !important;padding:0px !important;border:none !important">\
        <img src="http://assetscdn.vodpod.com/images/widget/popout_large2.gif"  style="border:none !important;margin:0px !important;padding:0px !important;"/>\
      </a>\
      <div style="clear:both;"></div>\
    </div>';
  
  // Determine if widget is on right or left side of the page
  var widget_left = vp_offsetLeft(widget4116776309);
  var widget_width = widget4116776309.offsetWidth;
  var widget_right = widget_left + widget_width;
  var video_thumb_left = vp_offsetLeft(vodpod_video);
  
  // If widget is horizontally positioned (width > 400)
  // then display the videos from left to right
  if (widget_width > 400)
  {
    // Don't let video extend beyond widget
    if ((video_thumb_left + 400) > widget_right)
    {
      video_left = widget_right - 400;
    } else {
      video_left = video_thumb_left;
    }
  }
  else 
  {
    // Otherwise, if the widget is vertical, figure out what side of the page it's on,
    // and display the videos accordingly
    if (widget_left < document.body.clientWidth/2)
    {
      // left
      video_left = widget_left + widget4116776309.offsetWidth;
    } else {
      // right
      video_left = widget_left - 400 - 2;
    }
    
  }
  
  video_div.style.left = video_left + "px";
 
  var vid_html = '<div class="ed_holder" style="background:#606060 !important;position:relative !important;width:400px;height:320px;border-style:solid !important;border-width:0px 1px !important;border-color:#606060 !important;">' + vid_html + '</div>\
    <div style="width:384px;background:#f1f1f1 !important;overflow:hidden;border-style:solid !important;border-width:0px 1px !important;border-color:#606060 !important;padding:8px !important;margin:0px !important;">\
      <div class="vodpod_description" style="color:#666;padding-top:5px !important;padding-bottom:5px !important;max-height:36px;overflow:hidden;line-height:18px;">' + descrp + '</div>\
      <div style="color:#aaa;text-transform:uppercase;font-size:9px;font-weight:bold;height:14px;overflow:hidden;padding-top:5px !important">\
        <div style="float:left;text-align:left;width:255px;overflow:hidden;white-space:nowrap;">' + 
          vp_videos[id].stats.total_views + ' views\
          &nbsp;&nbsp;&nbsp;Video from <a href="' + vp_videos[id].original_url + '" target="_new" style="color:#aaa;">' + vp_videos[id].embed_host + '</a>\
        </div>\
        <div style=\"float:right;\">\
          Added ' + date + '\
        </div>\
        <div style="clear:both"></div>\
      </div style="text-align:left;">';
  
  if (vp_videos[id].num_collectors > 1) {
    vid_html += '<a href="http://vodpod.com/pod/video/' + id + '" style="font-size:11px;font-weight:bold;color:#00adef" target="_new">Collected by ' + vp_videos[id].num_collectors + ' people</a>';
  }
  
  vid_html += '</div>\
    <div style="width:402px;background:#606060 !important;">\
      <a href="http://vodpod.com/widgets?r=widget" target="_new" style="float:right;color:#fff;margin-right:8px !important;line-height:16px !important;text-decoration:none;">\
        <div style="float:left">I collect with</div>\
        <img src="http://assetscdn.vodpod.com/images/widget/logo_10px.png" class="vodpod_png" style="float:left; width:10px; height:10px; display:inline; margin-top:3px !important; margin-left:4px !important; margin-right:4px !important;"/>\
        <div style="float:left;display:inline;">vodpod</div>\
      </a>\
      <div style="clear:both;"></div>\
    </div>\
    <div style="background:url(http://assetscdn.vodpod.com/images/widget/player_bottom_402px.gif) no-repeat !important;height:3px;padding:0px !important;margin:0px !important;overflow:hidden;"></div>';
  
  video_div.innerHTML += vid_html;
  
  vp_EmbedSwapper.run(top, top + 447);
  
  document.body.appendChild(video_div);

	vp_DragHandler.attach(video_div, video_div.getElementsByTagName("div")[1]);
	  
  vp_fixIePngs(document.body);
  vpAddTracking(vp_videos[id].pod_id, id);
  
}

function vp_scrollTop() {
  if (document.body.scrollTop) {
    // Some browsers (WebKit) do this the web-standards way.
    return (document.body.scrollTop);
  } else {
    // And some just mimic IE 6 (everyone else).
    return (document.documentElement.scrollTop);
  }
}

function vp_loadVideo2(id) {
  vp_closeVideo();
  
  var container = document.createElement('div');
  var iframe = document.createElement('iframe');
  var close_img = document.createElement('img');
  
  if (Math.random() < 0.5) {
    iframe.src = 'http://widgets.vodpod.com' + '/javascripts/video_popup/' + id;
  } else {
    iframe.src = 'http://widgets.vodpod.com' + '/javascripts/video_popup/' + id + '?ad=user';
  }

  var scrollTop = vp_scrollTop();
  
  var top = Math.max(((document.documentElement.clientHeight / 2) + (scrollTop)), 292);
  
  iframe.style.border = '0';
  iframe.frameBorder = 0;
  iframe.allowTransparency = true;
  iframe.style.width = '100%';
  iframe.style.height = '100%';
  iframe.style.overflow = 'hidden';
  iframe.scrolling = 'no';
  
  container.id = 'vodpod_widget_popup';
  container.style.width = '818px';
  container.style.height = '584px';
  container.style.marginTop = '-292px';
  container.style.marginLeft = '-409px';
  container.style.position = 'absolute';
  container.style.left = '50%';
  container.style.zIndex = '1000';
  container.style.top = top + 'px';
  
  close_img.src = 'http://assetscdn.vodpod.com/images/widget/close_large.png'
  close_img.style.position = 'absolute';
  close_img.style.top = '32px';
  close_img.style.right = '32px';
  close_img.style.border = '0';
  close_img.style.cursor = 'pointer';
  
  vp_EmbedSwapper.run(top - 292, top + 292);
  
  close_img.onclick = function() {
    vp_closeVideo();
  }
  
  // if (/MSIE (6|7)/.test(navigator.userAgent)) {
  //   // We can't attach to the iframe.
  //   setTimeout(function() {
  //     container.appendChild(close_img);
  //   }, 1000);
  // } else  {
  //   iframe.onload = function() {
  //     container.appendChild(close_img);
  //   }
  // }
  
  setTimeout(function() {
    container.appendChild(close_img);
  }, 1000);
  
  container.appendChild(iframe);
  
  document.body.appendChild(container);
}

function vp_loadVideo(id, video_id) {
  if (hosted_url) {
    // this is for legacy ERb vodspots
    document.location = "http://" + hosted_url + "/?id=" + id;
    return false;
  } else if(custom_url) {
    // this is for laminate vodspots
    var url = 'http://' + custom_url.replace('%id%', video_id);
    document.location = url;
    return false;    
  }
  
  if (/Camino/.test(navigator.userAgent))
    vp_loadVideo1(id);
  else
    vp_loadVideo1(id);
  
  
}

function vp_closeVideo() {
  el = document.getElementById('vodpod_widget_popup');
  if (el) {
    el.parentNode.removeChild(el);
  } else {
    embed_holder = document.getElementById('vodpod_player_container');
    if (embed_holder != null)
      embed_holder.parentNode.removeChild(embed_holder);

    els = vp_getElementsByClassName(widget4116776309, 'vodpod_video_placeholder1')
    for (i=0; i < els.length; i++) {
      els[i].style.opacity = 0.8;
    }
  }
}

var thechild = null;

function vp_popoutVideo(id) {
  vid_html = vp_videos[id].autoplay_embed_tag;
  var child = window.open('', 'vp_popout', 'resizable=yes,status=no,toolbar=no,width=402,height=323');
  var el = child.document.createElement("div");
  el.innerHTML = vid_html;
  child.document.body.innerHTML = '';
  child.document.body.appendChild(el);
  
  vp_closeVideo();
  child.focus();
}

function vp_offsetTop(obj) {
    curtop = 0;
    if (obj.offsetParent) {
    curtop = obj.offsetTop
    while (obj = obj.offsetParent) {
      curtop += obj.offsetTop
    }
  }
  return curtop;
}

function vp_offsetLeft(obj) {
  curtop = 0;
  if (obj.offsetParent) {
    curtop = obj.offsetLeft;
    while (obj = obj.offsetParent) {
      curtop += obj.offsetLeft;
    }
  }
  return curtop;
}

function vp_fixIePngs(node)
{
  if (isIE6)
  {
    els = vp_getElementsByClassName(node, 'vodpod_png');
    var blankSrc = "http://assetscdn.vodpod.com/images/blank.gif";
  
    for (i=0; i < els.length; i++) {
      var img = els[i];
      var origSrc = img.src;
      img.src = blankSrc;
    
      filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + origSrc + "',sizingMethod='image')";
      img.style.filter = filter;
    }
  }  
}

function vp_getElementsByClassName(node, classname)
{
    var a = [];
    var re = new RegExp('\\b' + classname + '\\b');
    var els = node.getElementsByTagName("*");
    for(var i=0,j=els.length; i<j; i++)
        if(re.test(els[i].className))a.push(els[i]);
    return a;
}

function vp_videoMouseOver(container) {
  
    
    if (!isIE)
      vp_getElementsByClassName(container, 'vodpod_video_placeholder2')[0].style.display = 'block';
  
  
}

function vp_videoMouseOut(container) {
  
    
    vp_getElementsByClassName(container, 'vodpod_video_placeholder2')[0].style.display = 'none';
  
  
}

function vp_getCode() {
  var tag_src = 'http://widgets.vodpod.com/javascripts/get_widget_code?div_id=vodpod_widget_9138272&opts=id%3D1729%26v%3D2%26title%3DVIDEOS%2520DE%2520MATEMATICA%26options%5Btheme%5D%3Dsidebar4_white%26category_id%3Dlatest%26options%5Bcolor%5D%3D606060%26options%5Bdiv_id%5D%3Dvodpod_widget_9138272';
  var sc_tag = document.createElement("script");
  sc_tag.src = tag_src;
  document.body.appendChild(sc_tag);
}

function vp_showWidgetCode(content) {
  var docHeight = document.viewport.getHeight();

	var elt = document.createElement("div");
	elt.style.zIndex = 999999;
	var width = 400;
	var height = 300;
	elt.id = 'vp_code_lb';
	elt.style.width = width + 'px';
	elt.style.height = height + 'px';
	elt.style.position = 'absolute';
	elt.style.left = ((document.body.clientWidth/2) - (width/2)) + 'px'
	elt.style.top = ((docHeight / 2) + (vp_scrollTop()) - (height/2)) + 'px';
	elt.style.padding = '10px';
	elt.style.border = '4px solid black';
	elt.style.backgroundColor = 'white';
	elt.innerHTML = content;
	document.body.appendChild(elt);
	
  vp_EmbedSwapper.run(0, docHeight);
}

/**
*
*  Crossbrowser Drag Handler
*  http://www.webtoolkit.info/
*
**/

var vp_DragHandler = {

    // private property.
    _oElem : null,


    // public method. Attach drag handler to an element. I modified this function so you can provide a click_target which
    // will be the only element which can receive the mouse down, but its actual parent will be the element moved.
    attach : function(oElem, clickTarget) {
        clickTarget.onmousedown = vp_DragHandler._dragBegin;
        //oElem.onmousedown = vp_DragHandler._dragBegin;

        // callbacks
        oElem.dragBegin = new Function();
        oElem.drag = new Function();
        oElem.dragEnd = new Function();

        return oElem;
    },


    // private method. Begin drag process.
    _dragBegin : function(e) {
        var oElem = vp_DragHandler._oElem = this.parentNode;

        if (isNaN(parseInt(oElem.style.left))) { oElem.style.left = '0px'; }
        if (isNaN(parseInt(oElem.style.top))) { oElem.style.top = '0px'; }

        var x = parseInt(oElem.style.left);
        var y = parseInt(oElem.style.top);

        e = e ? e : window.event;
        oElem.mouseX = e.clientX;
        oElem.mouseY = e.clientY;

        oElem.dragBegin(oElem, x, y);

        document.onmousemove = vp_DragHandler._drag;
        document.onmouseup = vp_DragHandler._dragEnd;
        return false;
    },


    // private method. Drag (move) element.
    _drag : function(e) {
        var oElem = vp_DragHandler._oElem;

        var x = parseInt(oElem.style.left);
        var y = parseInt(oElem.style.top);

        e = e ? e : window.event;
        oElem.style.left = x + (e.clientX - oElem.mouseX) + 'px';
        oElem.style.top = y + (e.clientY - oElem.mouseY) + 'px';

        oElem.mouseX = e.clientX;
        oElem.mouseY = e.clientY;

        oElem.drag(oElem, x, y);

        return false;
    },


    // private method. Stop drag process.
    _dragEnd : function() {
        var oElem = vp_DragHandler._oElem;

        var x = parseInt(oElem.style.left);
        var y = parseInt(oElem.style.top);

        oElem.dragEnd(oElem, x, y);

        document.onmousemove = null;
        document.onmouseup = null;
        vp_DragHandler._oElem = null;
    }

}