if (document.images) {

	 home = new Image
     angebot = new Image
	 profil = new Image
     referenzen = new Image
	 preise = new Image
     kontakt = new Image
	 home_over = new Image
     angebot_over = new Image
	 profil_over = new Image
     referenzen_over = new Image
	 preise_over = new Image
     kontakt_over = new Image
	 
	 
	 
 	 home.src = 'images/home.gif'
 	 home_over.src = 'images/home_over.gif'
 	 angebot.src = 'images/angebot.gif'
 	 angebot_over.src = 'images/angebot_over.gif'
 	 profil.src = 'images/profil.gif'
 	 profil_over.src = 'images/profil_over.gif'
 	 referenzen.src = 'images/referenzen.gif'
 	 referenzen_over.src = 'images/referenzen_over.gif'
 	 preise.src = 'images/preise.gif'
 	 preise_over.src = 'images/preise_over.gif'
 	 kontakt.src = 'images/kontakt.gif'
 	 kontakt_over.src = 'images/kontakt_over.gif'
	
 }


var ioWindow;

function openWindow(url,x,y)
	{
	if (ioWindow) {if (!ioWindow.closed) ioWindow.close()}
	h=screen.availHeight-30;
	w=screen.availWidth-30;
	t=(h-y)/2; if (t<0) t=0;
	u=(w-x)/2; if (w<0) w=0;
	ioWindow = window.open(url,"popup",'width='+x+',height='+y+',left='+u+',top='+t+',scrollbars=auto');
	ioWindow.focus();
	}