/*
 
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]-->

*/

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

function fixPNG(myImage) 
{
    if ((version >= 5.5) && (version < 7) && (document.body.filters)) 
    {
       var imgID = (myImage.id) ? "id='" + myImage.id + "' " : ""
	   var imgClass = (myImage.className) ? "class='" + myImage.className + "' " : ""
	   var imgTitle = (myImage.title) ? 
		             "title='" + myImage.title  + "' " : "title='" + myImage.alt + "' "
	   var imgStyle = "display:inline-block;" + myImage.style.cssText
	   var strNewHTML = "<span " + imgID + imgClass + imgTitle
                  + " style=\"" + "width:" + myImage.width 
                  + "px; height:" + myImage.height 
                  + "px;" + imgStyle + ";"
                  + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
                  + "(src=\'" + myImage.src + "\', sizingMethod='scale');\"></span>"
	   myImage.outerHTML = strNewHTML	  
    }
}

function correctPNG(myImage) // correctly handle PNG transparency in Win IE 5.5 and 6.
{
   if ((version >= 5.5) && (document.body.filters)) 
   {
	  var img = myImage;
	  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 
		 var imgAttribs = img.attributes;
		 for (var j=0; j<imgAttribs.length; j++)
		 {
			var imgAttrib = imgAttribs[j];
			if (imgAttrib.nodeName == "align")
			{		  
			   if (imgAttrib.nodeValue == "left") imgStyle = "float:left;" + imgStyle
			   if (imgAttrib.nodeValue == "right") imgStyle = "float:right;" + imgStyle
			   break
			}
		 }
		 var strNewHTML = "<span " + imgID + imgClass + imgTitle
		 strNewHTML += " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
		 strNewHTML += "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
		 strNewHTML += "(src='" + img.src + "', sizingMethod='scale');\""
		 strNewHTML += " onmouseover=\"PNGswap('" + img.id + "');\" onmouseout=\"PNGswap('" + img.id +"');\""
		 strNewHTML += "></span>" 
		 img.outerHTML = strNewHTML
	  }
   }
}

function PNGswap(myID)
{
   var strOver  = "_on"
   var strOff = "_off"
   var oSpan = document.getElementById(myID)
   var currentAlphaImg = oSpan.filters(0).src
   if (currentAlphaImg.indexOf(strOver) != -1)
      oSpan.filters(0).src = currentAlphaImg.replace(strOver,strOff)
   else
      oSpan.filters(0).src = currentAlphaImg.replace(strOff,strOver)
}

function imgSwap(oImg)
{
   var strOver  = "_on"    // image to be used with mouse over
   var strOff = "_off"     // normal image
   var strImg = oImg.src
   if (strImg.indexOf(strOver) != -1) 
      oImg.src = strImg.replace(strOver,strOff)
   else
      oImg.src = strImg.replace(strOff,strOver)
}
