Using JQuery have the section with id="first" suddenly appear in the browser window

Using JQuery have the section with id="first" suddenly appear in the browser window

I did this


    Source Code

    <section id="first"> <!-- use for Ajax -->
    <form method="get" action="" id="add1">
    <fieldset>



    JS Code


    $(document).ready(function(){

    $("first").show();
    });



    Don't understand why it's not working :s?