function windowCenter(mypage, myname, w, h, scroll, resize) {
var winl = (screen.availWidth - w) / 2;
var wint = (screen.availHeight - h) / 2;
winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable='+resize+',status=no';
win = window.open(mypage, myname, winprops)
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}