function klik_header() {
		if (document.layers) {
			// netscape
			if (document.layers.credits.visibility != "show") {
				document.layers.credits.visibility = "show";
			} else {
				document.layers.credits.visibility = "hide";
			}
		} else {
			// explorer
			if (document.all.credits.style.visibility != "visible") {
				document.all.credits.style.visibility = "visible";
			} else {
				document.all.credits.style.visibility = "hidden";
			}
		}
	}
	
	browserW = 0;
	browserH = 0;
	
	function geladen() {
	
		if (document.layers) {
			//alert(window.innerHeight + " en " + window.innerWidth  );
			browserW = window.innerWidth;
			browserH = window.innerHeight;
			document.layers.credits.left = browserW - 230;
		
		} else {
			//alert(document.all.dummy.offsetHeight + " en " + document.all.dummy.offsetWidth );
			browserW = document.all.dummy.offsetWidth;
			browserH = document.all.dummy.offsetHeight;
			
			document.all.credits.style.left = browserW - 230;
		}
		//document.all.offsetHeight 
	}

	function extravenster(url) {
		window.open(url,"MeerInfo","scrollbars=yes,resizable,width=350,height=400");
	}
	
var MAC = navigator.userAgent.indexOf("Mac") != -1;
if (MAC) { document.writeln('<LINK REL="stylesheet" HREF="../artikel_mac.css" TYPE="text/css">'); }