function changePic(id)
{
	var helper = document.images['bigpic'].src;
	document.images['bigpic'].src=document.images[id].src;
	document.images[id].src=helper;
}

function openImage() 
	{ 
	 var breite=600; 
	 var hoehe=600; 
	 var positionX=((screen.availWidth / 2) - breite / 2); 
	 var positionY=((screen.availHeight / 2) - hoehe / 2); 
	 var url=document.images['bigpic'].src; 
	 pop=window.open('','','toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1,fullscreen=0,width='+breite+',height='+hoehe+',top=10000,left=10000'); 
	 pop.resizeTo(breite,hoehe); 
	 pop.moveTo(positionX,positionY); 
	 pop.location=url; 
}