[Rails] firebug jQuery undefined message in rails app

[John Merlino]

In rails app, I add the following line of code in application.js and I
get jQuery is not defined in firebug console.
In application.html.erb, I have the following:
<script type="text/javascript"
src="../javascripts/application.js"></script>
<script type="text/javascript"
src="../javascripts/jquery-1.4.2.js"></script>

and I installed jquery in public/javascripts

Any ideas what's going wrong? thanks for reply.

(function($) {

    var linksToInt = {
        "#pple": 0,
        "#serv": 1,
        "#sol": 2,
        "#dash": 3,
        "#adm": 4,
        "#inv": 5,
        "#stu": 6

    }

    /*
    links = document.getElementsByTagName("a");
    if(links.className.indexOf("div-link") > -1){
        links.onclick = function{
removeHash(this.getAttribute("href"));};
    }
    */


    $("a.div-link").click(function(){displayDiv($(this).attr("href"));});

    function displayDiv(id){
    var linkInt = linksToInt[id];
    on_btn_click(linkInt);
    }

    function on_btn_click(displayDiv){
        displayDiv != null ? null : this;

        switch(displayDiv){
            case 0:
                $(content).empty();
                $(displayDiv).show();
                break;
            case 1:
                $(content).empty();
                $(displayDiv).show();
                break;
            case 2:
                $(content).empty();
                $(displayDiv).show();
                break;
            case 3:
                $(content).empty();
                $(displayDiv).show();
                break;
            case 4:
                $(content).empty();
                $(displayDiv).show();
                break;
            case 5:
                $(content).empty();
                $(displayDiv).show();
                break;
            case 6:
                $(content).empty();
                $(displayDiv).show();
                break;
        }
    }

})(jQuery);
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