<!--
function windowopen(url,hei,wid)
{
	if(!hei) hei = 300;
	if(!wid) wid = 500;
	if(!url) url = "#";
    hoogte = (screen.height/2)-(hei/2);
    breedte = (screen.width/2)-(wid/2);
    yeni = window.open( url , 'newwindow','location=no,scrollbars=no,width='+ wid +',height='+ hei +',top='+ hoogte +',left='+ breedte);
}
//-->