var myAgent   = navigator.userAgent.toLowerCase();
var isOpera = (myAgent.indexOf("opera") != -1);
var isIE   = ((myAgent.indexOf("msie") != -1)  && (!isOpera));

function downloadcat(key)
{
	var elems;
	
	if (isIE || isOpera) {
		elems = document.getElementsByTagName("div");
	}
	else {
		elems = document.getElementsByName("dl");
	}

	for (var i = 0; i < elems.length; i++) {
		if (isIE && (elems.item(i).name != "dl")) {
			continue;
		}
		if ((key=="none") || (key==elems.item(i).id)) {
			elems.item(i).style.display = "";
		} else {
			elems.item(i).style.display = "none";
		}
	}

	return false;
}

function articlecat(key)
{
	var elems;
	
	if (isIE || isOpera) {
		elems = document.getElementsByTagName("div");
	}
	else {
		elems = document.getElementsByName("article");
	}

	for (var i = 0; i < elems.length; i++) {
		if (isIE && (elems.item(i).name != "article")) {
			continue;
		}
		if ((key=="none") || (key==elems.item(i).id)) {
			elems.item(i).style.display = "";
		} else {
			elems.item(i).style.display = "none";
		}
	}

	return false;
}