How do I make this function behave as I want it to? (Select onchange problem)

How do I make this function behave as I want it to? (Select onchange problem)

I have the following function:

  1.     $("#paamelding_form select").change(function () {
            $("option:selected").click(function() {
        if ($(this).hasClass("double_0") || $(":selected").hasClass("")) {
                var oldID = ($(this).parent("select").attr("id").match(/\d+$/));
                var newID = ++oldID;
                alert("remove" + newID);
                $("#pulje_" + newID).removeAttr("disabled","disabled").css({ 'border-color' : ' #000', 'background-color' : '#ddd'});
                $.cookie("pulje_" + newID +"","enabled", { path: '/' });
                alert($.cookie("pulje_" + newID + ""));
                $("label[for='pulje_" + newID + "']").css({ 'color' : '#2F5376'}).find(".double_warning").remove();
            }
            if ($(this).hasClass("double_1")) {
                var oldID = ($(this).parent("select").attr("id").match(/\d+$/));
                var newID = ++oldID;
                alert("add" + newID);           
                $("#pulje_" + newID).attr("disabled","disabled").css({ 'border-color' : ' #777', 'background-color' : 'eee'});
                $.cookie("pulje_" + newID +"","disabled", { path: '/' });
                alert($.cookie("pulje_" + newID + ""));           
                $("label[for='pulje_" + newID + "']").css({ 'color' : '#2F5376'}).find(".double_warning").remove();
                if($("option:selected").text() == 'Gopher') {
                var double_warning = "<small class='double_warning'><span class='double_warning' style='color: red;'>Du valgte gopher i forrige delpulje og vil bli satt opp som gopher i denne delpuljen også</span></small>";
                } else {
                var double_warning = "<small class='double_warning'><span class='double_warning' style='color: red;'>Du valgte et spill som varer i to delpuljer, dette valget er derfor ikke tilgjengelig</span></small>";
                }
                $("label[for='pulje_" + newID + "']").css({ 'color' : '#aaa'}).append(double_warning);
                }
            });

























  2. });
This works, but only for mouseclicks. It's probably also extremely crappy code to begin with - I'm pretty new to jquery, and I tend to go with what works for now - and this does. But I'd like it to work for both mouseclicks and when people navigate the form using the keyboard - any hints or improvements that can be done to the code to make it behave like I want it to?