function popup(URL,W,H) {
day = new Date();
id = day.getTime();
l = (screen.width/2) - (W/2);
t = (screen.height/2) - (H/2);
eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=0,width="+W+",height="+H+",left ="+l+",top = "+t+"');");
}