Help converting a Mootools Class.

I've used jQuery and I know how to use it, but I'm still rusty.

Wondering if someone can help me convert the following mootools class to jquery - it's really short.
I can't seem to find the right information on how to write a jQuery class or convert one from mootools.

var mySelectMenu = new Class({
    Implements: [Options, Events],
    initialize: function (a, b) {
        this.setOptions(b);
        this.selectitems = $(a);
        this.selectitems.getFirst().addClass("selectTitle").setAttribute("disabled", true);
        this.addActions()
    },
    addActions: function () {
        this.selectitems.addEvent("change", function () {
            this.fireEvent("select", [this.selectitems.getElement(":selected").get("value"), this.selectitems])
        }.bind(this))
    }
});