var oldimg ="nav_1";
var oldnav ="";
var oldcont="content_1";
var myurl = "";
var newimg;
var end = 24;
var old_bigimage;
var oldleiste = "";
var i = 0;
var wohin;
var direkt;
var navaktiv = "";



function mittig() {

	if(document.layers) {
		var breit = window.innerWidth;
		var hoehe = window.innerHeight;
	} else {
		var breit = document.body.clientWidth;
		var hoehe = document.body.clientHeight;
	}

	
	breit -= 950;
	hoehe -= 670;
	
	links = breit/2;
	oben = hoehe/2;
	
	if(oben<=0)  {
		oben = 10;
	}
	
	DivObjStyle('aktion').left = links;
	DivObjStyle('aktion').top = oben;
	
	
	return true;
}




// Navigationsfunktionen

	function subiunakt(myimage) {
		if(oldimg!=myimage || oldimg=="") {
			if(navaktiv!=myimage)  {
					document.getElementById(myimage).src="grafik/elemente/"+ myimage +"_akt.gif";
			}
		}
	}
	
	function subiakt(myimage) {
		if(oldimg!=myimage) {
			document.getElementById(myimage).src="grafik/elemente/"+ myimage +"_over.gif";
		}
	}
	
	function aktiv_home() {
			DivObjStyle('navi_4_akt').visibility   = "visible";
			DivObjStyle('navi_4_inakt').visibility = "hidden";
	}
	
	
	function gohome(status)  {
		DivObjStyle('navi_4_akt').visibility   = "hidden";
		DivObjStyle('navi_4_inakt').visibility = "visible";
			
		if(status)  {
			document.location = "index.html";
		}
	}

		
	
	function showcont(content,myimage)  {
		
				if(oldimg!="" && oldimg!=myimage) {
					document.getElementById(oldimg).src="grafik/elemente/"+ oldimg +".gif";
				}
				document.getElementById(myimage).src="grafik/elemente/"+ myimage +"_akt.gif";
				if(oldcont!="" && oldnav!=content) {
					DivObjStyle(oldcont).visibility = "hidden";
				}
				DivObjStyle(content).visibility = "visible";

			
				oldimg=myimage;
				oldcont = content;
	}