function popcbox() {
cboxwin = window.open("","Cbox","width=400,height=500,toolbar=no,scrollbars=no,status=no,resizable=yes");
cboxwin.document.write('Cbox');
cboxwin.document.write('');
cboxwin.document.write(''); cboxwin.document.write('Cbox needs frames!');
try {
x = screen.width;
y = screen.height;
cboxwin.moveTo(Math.max((x/2)-100, 0), Math.max((y/3)-190));
} catch (e) {};
}

чат в отдельном окошке