function popup_window(url, window_name, allow_toolbar, allow_location, allow_directories, allow_status, allow_menu, allow_scroll, allow_resize, win_width, win_height) {
        var xLeft = (screen.availWidth / 2) - (win_width / 2);
        var yTop = (screen.availHeight / 2) - (win_height / 2);
        window.open(url, "" + window_name + "", "toolbar=" + allow_toolbar + ",location=" + allow_location + ",directories=" + allow_directories + ",status=" + allow_status + ",menubar=" + allow_menu + ",scrollbars=" + allow_scroll + ",resizable=" + allow_resize + ",width=" + win_width + ",height=" + win_height + ",left=" + xLeft + ",top=" + yTop + "");
    }

    function OpenModalChildWindow(sURL, sWindow, lWidth, lHeight) {
        //open a new dialog window
        var sFeatures = "dialogHeight: " + lHeight + "px;";
        sFeatures += "dialogWidth: " + lWidth + "px;";
        sFeatures += "center: yes;";
        sFeatures += "edge: sunken;";
        sFeatures += "scroll: no;";
        sFeatures += "status: yes;";
        sFeatures += "resizeable: no;";

        entryWindow = window.showModalDialog(sURL, sWindow, sFeatures);
        
        return entryWindow;
        
    }