function addEvent(elm, evType, fn, useCapture)
// cross-browser event handling for IE5+, NS6+ and Mozilla/Gecko
// By Scott Andrew
{
  if (elm.addEventListener) {
    elm.addEventListener(evType, fn, useCapture);
    return true;
  } else if (elm.attachEvent) {
    var r = elm.attachEvent('on' + evType, fn);
    return r;
  } else {
    elm['on' + evType] = fn;
  }
}

function setDisplay(id, value) {
	document.getElementById(id).style.display = value;
}

function removeChildren(parent) {
	for (var i = parent.childNodes.length - 1; i >= 0; --i) {
		parent.removeChild(parent.childNodes[i]);
	}
}

function page_anchor() {
	var url = document.URL;
	var hashidx = url.indexOf('#');
	if (hashidx > 0)
		return url.substr(hashidx + 1);
	else
		return null;
}

function correctPNG() // correctly handle PNG transparency in Win IE 5.5 & 6.
{
	if (navigator.appName == "Microsoft Internet Explorer") {
		var arVersion = navigator.appVersion.split("MSIE")
		var version = parseFloat(arVersion[1])
		if ((version >= 5.5) && (version < 7.0) && (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--;
				}
			}
		}
	}
}