var win=null;

function FormWindow(Url)
{
LeftPosition=(screen.width)?(screen.width-460)/2:100;
TopPosition=(screen.height)?(screen.height-420)/2:100;
settings='width=460,height=420,top='+TopPosition+',left='+LeftPosition+',scrollbars=yes,location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no';
win=window.open(Url,'form_popup',settings);
}