function fwin1()
{
sub = window.open("f1.html","fwin1","toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,width=300,height=300");
x = (screen.width  - 300) / 2;
y = (screen.height - 300) / 2;
sub.moveTo(x,y);
}

function fwin2()
{
sub = window.open("f2.html","fwin1","toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,width=300,height=300");
x = (screen.width  - 300) / 2;
y = (screen.height - 300) / 2;
sub.moveTo(x,y);
}

function fwin3()
{
sub = window.open("f3.html","fwin1","toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,width=300,height=300");
x = (screen.width  - 300) / 2;
y = (screen.height - 300) / 2;
sub.moveTo(x,y);
}

function fwin4()
{
sub = window.open("f4.html","fwin1","toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,width=300,height=300");
x = (screen.width  - 300) / 2;
y = (screen.height - 300) / 2;
sub.moveTo(x,y);
}