disable button when save to databasedotcom

disableBtn

<apex:includeScript value="{!URLFOR($Resource.res, 'js/jquery-1.4.2.min.js')}" />
    <script type="text/javascript">
        $j = jQuery.noConflict();
        function disableBtn()
        {
            $j(".btn:visible").each(function () {
                $j(this).css('display', 'none');
                $j(this).parent().append('<input type="button" name="inlineSubmitting" title="Submitting" class="btnDisabled" value="saving..."/>');
            });
        }
    </script>