/*
 Activates alpha transparent PNG background images for IE browser version 5.5 - 7.0.
 Expects an css background-image 
 */
function setBackgroundImageTransparentForIE(elementId) {
	var version = parseFloat(navigator.appVersion.split('MSIE')[1]);
	if ((version >= 5.5) && (version < 7) && (document.body.filters)) {
		// if IE5.5+ on win32, then display PNGs with AlphaImageLoader
		var cBGImg = $(elementId).currentStyle.backgroundImage;
		if (cBGImg != undefined && cBGImg != "") {
			var cImage = cBGImg.substring(cBGImg.indexOf('"') + 1, cBGImg.lastIndexOf('"'));
			if (cImage != "") {
				$(elementId).style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + cImage + "', sizingMethod='scale')";
				$(elementId).style.backgroundImage = "none";
			}
		}
  };
}