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<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $(document).ajaxError(function(){
        alert("An error occured!");
    });
    $("button").click(function(){
        $("div").load("wrongfile.txt");
    });
});
</script>
</head>
<body>

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<button>Change Content</button>

</body>
</html>