jQuery event on value change of input hidden

I have this input hidden:

<input id="j_idt26:myValue" type="hidden" name="j_idt26:myValue" value="0?100?">

I want to alert "hey" the first time the value is set and then every time it changes.

I have something like this:

$(document).ready(function(){
    var $hello= $('[id$=myValue]');

    $hello.bind("change load", function(){
        alert('hey');
    });
});

But nothing is showing up.
If you can help
Thanks