function popup(mypage, myname, w, h, scroll, tool, menu) { 
var winl = (screen.width - w) / 2;                      
var wint = (screen.height - h) / 2;
winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',toolbar='+tool+',menubar='+menu+','
win = window.open(mypage, myname, winprops)
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}