Validación de numero JQUERY

<script src="comun/datePickerJQuery/js/jquery-1.7.2.min.js">

</script>
<script>    $("#number").on({
        "focus": function(event) {
            $(event.target).select();        },        "keyup": function(event) {
            $(event.target).val(function(index, value) {
                return value.replace(/\D/g, "")
                    .replace(/([0-9])([0-9]{2})$/, '$1.$2')
                    .replace(/\B(?=(\d{3})+(?!\d)\.?)/g, ",");            });        }
    });</script>