Adding mask using Jquery

<script language="javascript" src="../../js/jquery.maskedinput.js" type="text/javascript"></script>

<script type="text/javascript">
    $(document).ready(function () {

      //Input mask for ABN
        $('#txtABNstep1').mask('?ABN 99 999 999 999');

        //Input mask for Contact number      
        $('#txtContactNumberStep1').mask('(99) 9999-9999');

        //Input mask for Contact mobile phone
        $('#txtMobileNumberStep1').mask('9999999999');


});