function newwin1()
{
sub = window.open("pv_window.htm","window1","toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,width=500,height=600");
x = (screen.width  - 500) / 2;
y = (screen.height - 600) / 2;
sub.moveTo(x,y);
}