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() {
	if (document.images) {
		k2_over = newImage("images/k2-over.jpg");
		k3_over = newImage("images/k3-over.jpg");
		k4_over = newImage("images/k4-over.jpg");
		k7_over = newImage("images/k7-over.jpg");
		preloadFlag = true;
	}
}

function anpassen(){
hoehe = document.body.clientHeight-190;
document.getElementById('content').style.height = hoehe;
}