<div id=goTo onclick="location.href='post.php?id=21';"> go to this page/div>

<div id=deactivate>[click to deactivate]</div>
     <div id=reactivate>[click to reactivate]</div>

$("#deactivate").click(function(){
             $("#goTo").removeAttr("onclick");
   });

var flag = true;

$("#goTo").on("click", function(){
   if(!flag)
    return;
   location.href='post.php?id=21';
});


$("#deactivate").on("click", function(){
  flag = false;
})

$("#reactivate").on("click", function(){
  flag = false;
})