if (window.Event)

  document.captureEvents(Event.MOUSEUP);

function nocontextmenu()

{

       event.cancelBubble = true

       event.returnValue = false;

       return false;

}

function norightclick(e)

{

       if (window.Event)

       {

               if (e.which == 2 || e.which == 3)

                       return false;

       }

       else

               if (event.button == 2 || event.button == 3)

               {

                       event.cancelBubble = true

                       event.returnValue = false;

                       return false;

               }

}

document.oncontextmenu = nocontextmenu;

document.onmousedown = norightclick;