function createWindow(iUrl) {
popwin=window.open('','_blank','toolbar=no,menubar=no,resizable=yes,scrollbars=yes,innerHeight=600,height=600,innerWidth=800,width=800');
popwin.document.open();
popwin.document.write('Weergave');
popwin.document.close();
}
function popup(URL) {
width = 500;
height = 500;
scrwidth = self.screen.availWidth;
scrheight = self.screen.availHeight;
newWindow = window.open(URL, '_blank', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=' + width + ',height=' + height + ',top=' + ( (scrheight - height) / 2 ) + ',left=' + ( (scrwidth - width) / 2));
}