нужен скрипт для блокировки правой кнопки мыши

<script type="text/javascript">function preventSelection(element){ 




  var preventSelection = false;






 






  function addHandler(element, event, handler){






    if (element.attachEvent) 






      element.attachEvent('on' + event, handler);






    else 






      if (element.addEventListener) 






        element.addEventListener(event, handler, false);






  }






  function removeSelection(){






    if (window.getSelection) { window.getSelection().removeAllRanges(); }






    else if (document.selection && document.selection.clear)






      document.selection.clear();






  }






  function killCtrlA(event){






    var event = event || window.event;






    var sender = event.target || event.srcElement;






 






    if (sender.tagName.match(/INPUT|TEXTAREA/i))






      return;






 






    var key = event.keyCode || event.which;






    if (event.ctrlKey && key == 'A'.charCodeAt(0))  // 'A'.charCodeAt(0) можно заменить на 65






    {






      removeSelection();






 






      if (event.preventDefault) 






        event.preventDefault();






      else






        event.returnValue = false;






    }






  }






  addHandler(element, 'mousemove', function(){






    if(preventSelection)






      removeSelection();






  });






  addHandler(element, 'mousedown', function(event){






    var event = event || window.event;






    var sender = event.target || event.srcElement;






    preventSelection = !sender.tagName.match(/INPUT|TEXTAREA/i);






  });






  addHandler(element, 'mouseup', function(){






    if (preventSelection)






      removeSelection();






    preventSelection = false;






  });






  addHandler(element, 'keydown', killCtrlA);






  addHandler(element, 'keyup', killCtrlA);






}






 






preventSelection(document);






















if (document.layers){






document.captureEvents(Event.MOUSEDOWN);






}






 function rtclickcheck(keyp){






  if (document.layers && keyp.which != 1) {






    alert(mymessage);






    return false;






  }






  if (document.all && event.button != 1) { 






    alert(mymessage);






    return false;






  }






}






document.onmousedown = rtclickcheck






document.ondragstart = test;






//запрет на перетаскивание 






document.onselectstart = test;






//запрет на выделение элементов страницы






document.oncontextmenu = test;






//запрет на выведение контекстного меню






function test() {






return false






}</script>