function prepareImageSwap(titleimage) { 
//Do not delete these comments. 
//Non-Obtrusive Image Swap Script V1.1 by Hesido.com 
//Attribution required on all accounts 
	var regg = /menuimage\[(.*)\]$/ 
	var prel = new Array(), link, linkList, mtchd; 
	linkList = document.body.getElementsByTagName('a'); 
	for (var i=0; link = linkList[i]; i++) { 
		if(!link.rolloverSet && link.getAttribute("rel")!=null) {
			if(link.getAttribute("rel").match(regg)) {
				mtchd = link.getAttribute("rel").match(regg);
		 		link.hoverSRC = "images/gfx/"+mtchd[1]+"-over.png";
		 		link.outSRC = "images/gfx/"+mtchd[1]+".png";
		 		link.img = "menuimg_"+mtchd[1];
		 		preLoadImg(link.hoverSRC);
		 		link.onmouseover = linkHoverSwap;
		 		preLoadImg(link.outSRC);
		 		link.onmouseout = linkOutSwap;
		 		link.rolloverSet = true;
		 	}
 		}
	}
    function preLoadImg(imgSrc) { 
        prel[prel.length] = new Image(); prel[prel.length-1].src = imgSrc; 
    } 
} 
function linkHoverSwap() {
	document.getElementById(this.img).src = this.hoverSRC;
} 
function linkOutSwap() {
	document.getElementById(this.img).src = this.outSRC;
}

function tab_himmel() {
	document.getElementById("tab_himmel").style.display = "block";
	document.getElementById("tab_himmel_link").style.fontWeight = "bold";
	document.getElementById("tab_arbeitsplaetze").style.display = "none";
	document.getElementById("tab_arbeitsplaetze_link").style.fontWeight = "normal";
	document.getElementById("tab_lichter").style.display = "none";
	document.getElementById("tab_lichter_link").style.fontWeight = "normal";
}
function tab_lichter() {
	document.getElementById("tab_lichter").style.display = "block";
	document.getElementById("tab_lichter_link").style.fontWeight = "bold";
	document.getElementById("tab_himmel").style.display = "none";
	document.getElementById("tab_himmel_link").style.fontWeight = "normal";
	document.getElementById("tab_arbeitsplaetze").style.display = "none";
	document.getElementById("tab_arbeitsplaetze_link").style.fontWeight = "normal";
}
function tab_arbeitsplaetze() {
	document.getElementById("tab_arbeitsplaetze").style.display = "block";
	document.getElementById("tab_arbeitsplaetze_link").style.fontWeight = "bold";
	document.getElementById("tab_himmel").style.display = "none";
	document.getElementById("tab_himmel_link").style.fontWeight = "normal";
	document.getElementById("tab_lichter").style.display = "none";
	document.getElementById("tab_lichter_link").style.fontWeight = "normal";
}