//Event.observe(window, "load", AlphaImageLoader, false);   

function AlphaImageLoader()
{
    for(var i = 0; i < document.images.length; i++)
    {
        var img = document.images[i];
        ApplyPngTransform(img);
    }
}
function ApplyPngTransform(img)
{
    var isIE = window.ActiveXObject ? true : false;
    var userAgent = navigator.userAgent.toLowerCase();
    var version = 3;
    if(isIE)
    {
        var re = new RegExp("msie ([0-9]{1,}[\.0-9]{0,})"); 
        if(re.exec(userAgent) != null)
            version = parseFloat(RegExp.$1); 
        else
            version = 3; 
    }          
    
    if(!isIE || (isIE && version > 6))
		return;
		
    var imgSrc = img.src;
    if (imgSrc.indexOf(".png") > -1)
    {
        var w, h;
        w = img.width, h = img.height;
        img.src = "/Images/blank.gif";
        img.width = w, img.height = h;
        img.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src=\'" + imgSrc + "\', SizingMethod='scale');";
    }
}