/*
 
Correctly handle PNG transparency in Win IE 5.5 & 6.
http://homepage.ntlworld.com/bobosola. Updated 18-Jan-2006.

Use in <HEAD> with DEFER keyword wrapped in conditional comments:
<!--[if lt IE 7]>
<script defer type="text/javascript" src="pngfix.js"></script>
<![endif]-->
_______________________________________________________
Modificado em 02/08/2006 por Léo MacVal (leo@leomacval.com).
Adicionada a troca das imagens PNG por GIF de mesmo nome
caso o browser seja uma versão inferior à 5.5 do MSIE

*/
function pngfix() {
  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;
  		}
  	}
  } else {
    var browserName = new String(navigator.appName);
    if (browserName.indexOf('Netscape') == -1){
    	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") {
    			img.src = img.src.substring(0, img.src.length-4) + ".gif";
    		}
    	}
  	}
  }
}
