var win = null;

function popup(mypage,myname,w,h){
LeftPosition = (screen.width) ? (screen.width)/6 : 0;
TopPosition = 110;
settings ='width='+w+',height='+h+',top='+TopPosition+',left='+LeftPosition+',scrollbars=yes'
win = window.open(mypage,myname,settings)
if(win.window.focus) { win.window.focus(); }
}