function key(){ 
if(event.shiftKey){ 
event.returnValue = false;
}
//½ûÖ¹shift
if(event.altKey){ 
event.returnValue = false;
}
//½ûÖ¹alt
if(event.ctrlKey){ 
event.returnValue = false;
}
//½ûÖ¹ctrl
return false; }
document.onkeydown=key;

function disableRightClick(e)
{ 
  if(!document.rightClickDisabled) // initialize
  { 
    if(document.layers) 
    { 
      document.captureEvents(Event.MOUSEDOWN);
      document.onmousedown = disableRightClick;
    }
    else document.oncontextmenu = disableRightClick;
    return document.rightClickDisabled = true;
  }
  if(document.layers || (document.getElementById && !document.all))
  { 
    if (e.which==2||e.which==3)
    { 
      return false;
    }
  }
  else
  { 
    return false;
  }
}
disableRightClick();