function bbs()
{
sub = window.open("bbs.html","window1","toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,width=780,height=600");
x = (screen.width  - 780) / 2;
y = (screen.height - 600) / 2;
sub.moveTo(x,y);
}