Easy Youtube Js Library, new Youtube(+URLVideo)

gistfile1.js

window.onload = function(){
  function Youtube(urlYoutube)
  {
    var urlClear = urlYoutube;
    if(urlYoutube.lastIndexOf("?v=") != -1)
    {
       urlClear = urlYoutube.substring(urlYoutube.lastIndexOf("?v=") + 3);
       if(urlClear.indexOf("&") != -1);
        urlClear = urlClear.substring(0, urlClear.indexOf("&"));
    }
    url = 'http://gdata.youtube.com/feeds/api/videos/'+urlClear+'?v=2&alt=jsonc';
    
    var JsonArray = [];
    
    var http_request = new XMLHttpRequest();
    try
    {
      http_request = new XMLHttpRequest();
    }
    catch (e)
    {
      try
      {
         http_request = new ActiveXObject("Msxml2.XMLHTTP");
      }catch (e) {
         try{
            http_request = new ActiveXObject("Microsoft.XMLHTTP");
         }catch (e){
            alert("Too Old Browser or you are a wizzard!");
            return false;
         }
      }
   } 
   http_request.onreadystatechange  = function(){
      if (http_request.readyState == 4  )
      {
        var json = JSON.parse(http_request.responseText);
        JsonArray.push(json.data.title); //YtVideo
        JsonArray.push(json.data.uploader); //YtUserUpload
        JsonArray.push(json.data.uploaded); //YtPublished
        JsonArray.push(json.data.updated); //YtUpdated
        JsonArray.push(json.data.duration); //YtDutation
        JsonArray.push(json.data.category); //YtCategory
        JsonArray.push(json.data.description); //description
        JsonArray.push(json.data.thumbnail.sqDefault); //YtSmallImg
        JsonArray.push(json.data.thumbnail.hqDefault); //YtBigImg
        JsonArray.push(json.data.likeCount); //YtNumLikes
        JsonArray.push(parseInt(json.data.ratingCount) - parseInt(json.data.likeCount)); // Dislikes
        JsonArray.push(json.data.ratingCount); // TotalRate 
        JsonArray.push(json.data.viewCount); //YtViewsTotal
        JsonArray.push(json.data.favoriteCount); //YtFavCount
        JsonArray.push(json.data.commentCount); //YtCommentCount
      }
   }
   http_request.open("GET", url, false);
   http_request.send();
    
    this.Title = JsonArray[0];
    this.UserUpload = JsonArray[1];
    this.Uploaded = JsonArray[2];
    this.Updated = JsonArray[3];
    this.Duration = JsonArray[4];
    this.Category = JsonArray[5];
    this.Description = JsonArray[6];
    this.SmallThumb = JsonArray[7];
    this.BigThumb = JsonArray[8];
    this.Likes = JsonArray[9];
    this.Dislikes = JsonArray[10];
    this.TotalRate = JsonArray[11];
    this.Views = JsonArray[12];
    this.Favorites = JsonArray[13];
    this.NumCouments = JsonArray[14];
   }
};