function zurueck()
  {
   quelle = document.referrer;
   switch(quelle)
   {
    case "http://www.vonderruhren.de/aachenbahn/seiten/intern4_1.php":
    window.location.href = "intern4_1.php";
    break;
    case "http://www.vonderruhren.de/aachenbahn/seiten/intern4_2.php":
    window.location.href = "intern4_2.php";
    break;
    case "http://www.vonderruhren.de/aachenbahn/seiten/intern4_3.php":
    window.location.href = "intern4_3.php";
    break;
    case "http://www.vonderruhren.de/aachenbahn/seiten/intern4_4.php":
    window.location.href = "intern4_4.php";
    break;
    case "http://vonderruhren.de/aachenbahn/seiten/intern4_1.php":
    window.location.href = "intern4_1.php";
    break;
    case "http://vonderruhren.de/aachenbahn/seiten/intern4_2.php":
    window.location.href = "intern4_2.php";
    break;
    case "http://vonderruhren.de/aachenbahn/seiten/intern4_3.php":
    window.location.href = "intern4_3.php";
    break;
    case "http://vonderruhren.de/aachenbahn/seiten/intern4_4.php":
    window.location.href = "intern4_4.php";
    break;
    default:
    window.location.href = "intern4_1.php";
    break;
   }
}

function fensterauf(url)
{
 if (url) {
  Fenster = window.open(url,"Legende","dependent=yes,width=320,height=400,screenX=50,screenY=50,scrollbars=yes,resizable=yes");
  }
  else {
  Fenster = window.open("legende.php","Legende","dependent=yes,width=320,height=400,screenX=50,screenY=50,scrollbars=yes,resizable=yes");
  }
}

function picview(url, breite, hoehe)
{
 Fenster = window.open(url,"Bild","dependent=yes,width=" + breite + ",height=" + hoehe + "scrollbars=yes,resizable=yes");
 Fenster.outerHeight = hoehe;
 Fenster.outerWidth = breite;
}


/***********************************************
* Cool DHTML tooltip script- © Dynamic Drive DHTML code library (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit Dynamic Drive at http://www.dynamicdrive.com/ for full source code
***********************************************/

var ie=document.all
var ns6=document.getElementById && !document.all
if (ie) {
	var offsetxpoint=5
	var offsetypoint=20
}
if (ns6) {
	var offsetxpoint=0
	var offsetypoint=15
}
var enabletip=false
var tipobj = ""


function ietruebody(){
	return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}

function display(img, what){
	if (ns6||ie){
		if (ie||ns6)
			tipobj=document.all? document.all[what] : document.getElementById? document.getElementById(what) : ""
		enabletip=true
		return false
	}
}

function positiontip(e){
	if (enabletip){
		var curX=(ns6)?e.pageX : event.clientX + document.body.scrollLeft;
		var curY=(ns6)?e.pageY : event.clientY + document.body.scrollTop;
		//Find out how close the mouse is to the corner of the window
		var rightedge=ie&&!window.opera? ietruebody().clientWidth-event.clientX-offsetxpoint : window.innerWidth-e.clientX-offsetxpoint-20
		var bottomedge=ie&&!window.opera? ietruebody().clientHeight-event.clientY-offsetypoint : window.innerHeight-e.clientY-offsetypoint-20

		var leftedge=(offsetxpoint<0)? offsetxpoint*(-1) : -1000

		//if the horizontal distance isn't enough to accomodate the width of the context menu
		if (rightedge<tipobj.offsetWidth)
			//move the horizontal position of the menu to the left by it's width
			tipobj.style.left=ie? ietruebody().scrollLeft+event.clientX-tipobj.offsetWidth+"px" : window.pageXOffset+e.clientX-tipobj.offsetWidth+"px"
		else if (curX<leftedge)
			tipobj.style.left="5px"
		else
			//position the horizontal position of the menu where the mouse is positioned
			tipobj.style.left=curX+offsetxpoint+"px"

		//same concept with the vertical position
		if (bottomedge<tipobj.offsetHeight)
			tipobj.style.top=ie? ietruebody().scrollTop+event.clientY-tipobj.offsetHeight-offsetypoint+"px" : window.pageYOffset+e.clientY-tipobj.offsetHeight-offsetypoint+"px"
		else
			tipobj.style.top=curY+offsetypoint+"px"
		tipobj.style.visibility="visible"
	}
}

function hide(){
	if (ns6||ie){
		enabletip=false
		tipobj.style.visibility="hidden"
	}
}

document.onmousemove=positiontip