function popup(mypage,myname,w,h,features) {

            var win = null;

            

            //alert(features)

            var winl = (screen.width-w)/2;

            var wint = (screen.height-h)/2;

            if (winl < 0) winl = 0;

            if (wint < 0) wint = 0;

            

            if (features == true) {

                        features = "toolbar,menubar,scrollbars,resizable,location"

                        wint = wint-100;

            }

            else {

                        wint = wint-50;

            }

            var settings = 'height=' + h + ',';

            settings += 'width=' + w + ',';

            settings += 'top=' + wint + ',';

            settings += 'left=' + winl + ',';

            settings += features;

            win = window.open(mypage,myname,settings);

            win.window.focus();

}