Disable Button after Click

To prevent clicking a button more than once before it is loaded. Here is a script to prevent double click.

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
    window.onbeforeunload = function () {
        $("Button[ID=Button2], input[type=submit]").attr("disabled", "disabled");
    };
</script>