IE屏蔽右键

<script type="text/javascript">
      //屏蔽右键菜单
document.oncontextmenu = function (event){
 if(window.event){
  event = window.event;
 }try{
  var the = event.srcElement;
  if (!((the.tagName == "INPUT" && the.type.toLowerCase() == "text") || the.tagName == "TEXTAREA")){
   return false;
  }
  return true;
 }catch (e){
  return false;
 }
}
</script>