function Popup(page, target, wi, he) {

var winl = (screen.width-wi)/2; 
var wint = (screen.height-he)/2
var settings = 'left=' + winl + ', top=' + wint + ', width='+ wi +', height='+ he +',toolbar=no,menubar=no,location=no, resizable=no'
OpenWin = this.open(page, target, settings);
}