How Do I Get Fire Up A Jquery Function From Textbox In .Ascx And With Updatepanek On Master Page

<script type="text/javascript">
    $(document).ready(function () {
        Sys.WebForms.PageRequestManager.getInstance().add_endRequest(f_a);
        f_a(this);
    });
    function f_a(v_id) {
        return document.getElementById(v_id);
        $(document).ready(f_a(this));
    }
    var obj = document.getElementById("#<%=fmAuthRoles.FindControl("Telephonetextbox").ClientID %>");

    f_a(obj).maxLength = 14;

    f_a(obj).keyup = function (v_e) {
        v_e = v_e || window.event;

        if (v_e.keyCode >= 65 && v_e.keyCode <= 90) {
            this.value = this.value.substr(0, this.value.length - 1);
            return false;
        } else if (v_e.keyCode >= 37 && v_e.keyCode <= 40) {
            return true;
        }

        var v_value = (this.value.replace(/[^\d]/g, ''));
        if (v_value.length == 7) {
            this.value = (v_value.substring(0, 3) + "-" + v_value.substring(3, 7));
        }
        else if (v_value.length == 10) {
            this.value = ("(" + v_value.substring(0, 3) + ") " + v_value.substring(3, 6) + "-" + v_value.substring(6, 10));
        };
    }
</script>