function popup(url)
         {
            var settings  = 'height=' + screen.availHeight;
            settings += ',width=' + screen.availWidth;
            settings += ',top=' + 0;
            settings += ',left=' + 0;
            settings += ',menubar=' + "no";
            settings += ',toolbar=' + "no";
            settings += ',location=' + "no";
            settings += ',directories=' + "no";
            settings += ',status=' + "no";
            settings += ',scrollbars=' + "no";
            settings += ',resizable=' + "no";
      
            win = window.open(url, "popup_callback", settings);
            win.focus()
         } 

function popupscroll(url)
         {
            var settings  = 'height=' + screen.availHeight;
            settings += ',width=' + screen.availWidth;
            settings += ',top=' + 0;
            settings += ',left=' + 0;
            settings += ',menubar=' + "no";
            settings += ',toolbar=' + "no";
            settings += ',location=' + "no";
            settings += ',directories=' + "no";
            settings += ',status=' + "no";
            settings += ',scrollbars=' + "yes";
            settings += ',resizable=' + "yes";
      
            win = window.open(url, "popup_callback", settings);
            win.focus()
         }