Magento - jQuery function to sort configurable product attribute options by value

sortselectbox.js

jQuery.fn.sortOptionsByValue = function(){
    jQuery(this).each(function(){
        var op = jQuery(this).children("option");
        op.sort(function(a, b) {
            return a.value > b.value ? 1 : -1;
        });
        return jQuery(this).empty().append(op).val('').attr({selected: 'selected'});
    });
};