code: function createPreviewVideo(url){
          if ( !url )return;
  
          var conUrl = convert_url(url);
  
          conUrl = utils.unhtmlForUrl(conUrl);
  
          $G("preview").innerHTML = '<div class="previewMsg"><span>'+lang.urlError+'</span></div>'+
          '<embed class="previewVideo" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer"' +
              ' src="' + conUrl + '"' +
              ' width="' + 420  + '"' +
              ' height="' + 280  + '"' +
              ' wmode="transparent" play="true" loop="false" menu="false" allowscriptaccess="never" allowfullscreen="true" >' +
          '</embed>';
      }
docs: 根据url生成视频预览
  @param url