$(document).ready(function() {
  $("#keyinsert").keypress(function (e) {
    if(e.which == 13) {
      $.post("getlink.php", {key: $(this).val()}, function(res) {
        if(res.substr(0,3) != '#!?') {
          if(res == ">KEYCHANGED")
            alert("Key changed successfully!");
          else
            $("#keydiv").html(res);
        }
        else
          alert('Invalid Key!');
     });
    }
  });
 });