revert handle value in multi handle jqueryUI slider

revert handle value in multi handle jqueryUI slider

I have a multi handle jqueryui slider having range -30 to 50 , initially all handles set to zero. I want that if user slide any handle below zero then it automatically get set to zero.

jquery:

$(function () {
    $("#mySlider").slider({
        min: -30,
        max: 50,
        values: [0, 0, 0],
        slide: function (event, ui) {
            $(ui.handle).text(ui.value);
        },
        stop: function (event, ui) {
            if (ui.value < 0) {
            //here I want to set handle value zero.Can I set it using  $(ui.handle) object?
            };
        }
    });
});

Fiddle:http://jsfiddle.net/trivender/6NftK/20/