function press(e) 
      {
       if (navigator.appName =='Netscape' && (e.which == 3 || e.which == 2))
          return false;
       else if (navigator.appName == 'Microsoft Internet Explorer' && (event.button == 2 ||           event.button == 3)) 
             {
              alert("Sorry, the right-click has been disabled.");
              return false;
             }
       return true;
     }

   document.onmousedown=press;