function apneVindu(url,bredde,hoyde) {
var vindu;
var name = "tkPopupWindow";
var x = ( screen.availWidth - bredde ) / 2;
var y = ( screen.availHeight - hoyde ) / 2;
var features = "toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,copyhistory=1,resizable=1,width="+bredde+",height="+hoyde+",top="+y+",left="+x
vindu = window.open(url,name,features);
vindu.moveTo(x,y);
vindu.focus();
}