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var check=function(e)
 {
  e=e||window.event;
  //alert(e.which||e.keyCode);
  if((e.which||e.keyCode)==116)
  {
   if(e.preventDefault)
   { e.preventDefault();}
   else
   {
    event.keyCode = 0;
    e.returnValue=false;
   }  
            window.location.href = this.location.href;
  }
 }
 if(document.addEventListener){
  document.addEventListener("keydown",check,false);
 }
 else{
  document.attachEvent("onkeydown",check);
 }


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