function popup(name, file, width, height, scrolling)
{
        width = Math.min(width, screen.width-20);
        height = Math.min(height, screen.height-60);

        wleft = (screen.width - width) / 2;
        wtop  = (screen.height - height) / 2 - 20;

        win = window.open(file, name, "width=" + width + ",height=" + height + ",left=" + wleft + ",top=" + wtop + ",location=no,menubar= + ((scrolling)?'yes':'no'),resizable=" + ((scrolling)?'yes':'no') + " ,scrollbars=" + ((scrolling)?'yes':'no') + ",status=yes,toolbar= + ((scrolling)?'yes':'no') ");

        win.focus();
        self.moveTo(0,0);
        self.resizeTo(screen.availWidth,screen.availHeight);

}