var detectada = navigator.appVersion.split("MSIE")
var version = parseFloat(detectada[1])

if ((version >= 5.5) && (document.body.filters))
{
    for(var i=0; i<document.images.length; i++)
    {
       var img = document.images[i]; 
       var imgName = img.src.toLowerCase(); 
      if (imgName.substring(imgName.length-3, imgName.length) == "png") 
      {
          var strHTML = "<span " + " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;"   + ";" + 
"filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
+ "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>"
img.outerHTML = strHTML
      }
    }
}