function setPng() { 
    try{
        var oEle = arguments[0];
        oEle.width = oEle.height = 1; 
        oEle.className = oEle.className.replace(/\bpng\b/i,''); 
        oEle.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+ oEle.src +"',sizingMethod='image');" 
        oEle.src='';
    }catch(e){}
    return true;
}