function popcent(page, name, w, h, scrl, rez) {
var winx = (screen.width - w) / 2;
var winy = (screen.height - h) / 6;
winpopc = 'height='+h+',width='+w+',top='+winy+',left='+winx+',scrollbars='+scrl+',resizable='+rez+',toolbar=no,menubar=no,directories=no,status=no,copyhistory=yes,screenX=0,screenY=0'
win = window.open(page, name, winpopc)
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}