function submitForm()
{
	var sf = document.selectform;
	var c = sf.category_id.options[sf.category_id.options.selectedIndex].value;
	var d = sf.topicyear.options[sf.topicyear.options.selectedIndex].value;
	var querystring = ((c != "") || (d != "")) ? "?" : "";
	querystring += (c != "") ? ("c="+c) : "";
	querystring += ((c == "") && (d != "")) ? ("d="+d) : ((c != "") && (d != "")) ?  ("&d="+d) : "";
	document.location.href = "topics.php" + querystring;
}

function viewMedia(url, w, h, mediatype)
{
	var width = w;
	var height = h;
	if (width == 0)
	{
		width = 500;
	}
	if (height == 0)
	{
		height = 500;
	}
	//var height = 500;
	//var top = (screen.availHeight - height)/2;
	//var left = (screen.availWidth - width)/2;
	var top = 0;
	var left = 0;
	var features = "top=" + top + ",left=" + left + ",toolbar=no,location=no,menubar=no,resizable=no,status=no,scrollbars=no,width=" + width + ",height=" + height + "";
	var media_url = "mediaviewer.php?file="+url+"&mediatype="+mediatype+"&width="+width+"&height="+height;
	this.window.open(media_url,'Mediaviewer',features);
}