<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script>
var jQ = $.noConflict(true);
jQ(document).ready(function () {

// Change the name to your input name
jQ('input[name="number1"]').keypress(function (e) {

if (e.which != 8 && e.which != 0 && (e.which < 48 || e.which > 57)) {
jQ('input[name="number1"]').after('<span id="error">Numbers only Please!.</span>');
jQ('#error').fadeOut(2000);
return false;
}
});
});
</script>