function uurrooster(url)
{
if (window.screen) {
var chasm = screen.availWidth;
var mount = screen.availHeight;
  LOV = open (url,"uurrooster","location=0,scrollbars=yes,toolbar=yes, dependent=yes, height=600,resizable=yes,width=1000,left=' + ((chasm - 1000 - 10) * .5) + ',top=' + ((mount - 600 - 10) * .5) + ',status=no,menubar=1");
}
}