function addTransparency() {
	var arVersion = navigator.appVersion.split("MSIE")
	var version = parseFloat(arVersion[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.toUpperCase()
	      if (imgName.substring(imgName.length-3, imgName.length) == "PNG") {
	         var imgID = (img.id) ? "id='" + img.id + "' " : ""
	         var imgClass = (img.className) ? "class='" + img.className + "' " : ""
	         var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
	         var imgStyle = "display:inline-block;" + img.style.cssText 
	         if (img.align == "left") imgStyle = "float:left;" + imgStyle
	         if (img.align == "right") imgStyle = "float:right;" + imgStyle
	         if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle
	         var strNewHTML = "<span " + imgID + imgClass + imgTitle
	         + " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
	         + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
	         + "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>" 
	         img.outerHTML = strNewHTML
	         i = i-1
	      }
	   }
	}
	
	//altera o background nas regras dos arquivos css - luis carlos - luis@pevermelho.art.br
	//sizingMethod='none' -> none image scale crop
	var string='';
	var t = '';
	var tmp = document.styleSheets;
	for(h in document.styleSheets) {
		for(i in document.styleSheets[h].rules) {
			for (j in document.styleSheets[h].rules[i]) {
				if(j=='style')		
					for(k in document.styleSheets[h].rules[i][j]) {
						if(k=='background' && document.styleSheets[h].rules[i][j][k]!='') {
							t = document.styleSheets[h].rules[i][j][k];
							if(t.indexOf('.png')!=-1) {
								string = t.substr(t.indexOf('(')+1);
								string = string.substring(3, string.indexOf(')'));
								document.styleSheets[h].rules[i].style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+string+"', sizingMethod='none');";
								document.styleSheets[h].rules[i][j][k]="transparent";
							}
						}
					}
				
					
			}
		}
	}
}