function popup() {
var w = 400;
var h = 280;
var winl = Math.floor((screen.width - w) / 2);
var wint = Math.floor((screen.height - h) / 2);

	var cover_win = window.open('productd.asp','', "Width="+w+",Height="+h+",Menubar=no,Toolbar=no,Status=no,Scrollbars=yes,Resizable=yes,titlebar=0,Top="+wint+",Left="+winl+"");
}