function popupwindow(mypage, myname, w, h, scroll)
{
var winl = (screen.width - w) / 2;
var wint = (screen.height - h) / 2;
winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable=yes,status=yes'
mywindow = window.open(mypage, myname, winprops)
isOpened = true;
if (parseInt(navigator.appVersion) >= 4) { mywindow.window.focus(); }
}