function newImage(arg) {

if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
		if (document.images && (preloadFlag == true)) {
				for (var i=0; i<changeImages.arguments.length; i+=2) {
					document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
					
		}
	}
}

var preloadFlag = false;
function preloadImages(page) {
if (document.images) {
		if (page=="navi") {
		a_over = newImage("/arts/navigation/pfeil.jpg");
		}
		if (page=="bann") {
		suchen_over=newImage("arts/navigation/suchen-r.jpg");
		}
		if (page=="zoo01") {
		assistent_over=newImage("../arts/zoofach/assistent-r.jpg");
		experte_over=newImage("../arts/zoofach/experte-r.jpg");
		}
		preloadFlag = true;
		
	}
}