function preloadimgs () {
	img1 = new Image();
	img1.src="http://ottz.de/images/home_a.gif";
	img2 = new Image();
	img2.src="http://ottz.de/images/glossar_a.gif";
	img3 = new Image();
	img3.src="http://ottz.de/images/blog_a.gif";
	img4 = new Image();
	img4.src="http://ottz.de/images/links_a.gif";
	img5 = new Image();
	img5.src="http://ottz.de/images/kontakt_a.gif";
}

function doHover(b,i)
{
	f = document.getElementById(b).src;
	f = f.substr(0,f.length-5);
	f+=i+'.gif';
	document.getElementById(b).src = f;
}