test ids

HTML

<script src="http://select-box.googlecode.com/svn/trunk/jquery.selectbox-0.1.3.min.js"></script>
<link rel="stylesheet" href="http://select-box.googlecode.com/svn/trunk/jquery.selectbox.css">
<div id="languageOptions">
<select id="language" size=5 multiple="multiple">
    <option value="javascript">Javascript</option>
    <option value="objective-c">Objective C</option>
    <option value="python">Python</option>
</select>
</div>

JavaScript

jQuery(document).ready(function() {
    function OuvreSaisie(){
        if ($('#choix option:selected').val() == 0) {
           $('#blockOptions').hide();
           $('#blockNew').show();
           $('#nouveauChoix').focus();
        }
    }
    $('#languageOptions').click(function(){

               alert($('#language option:selected').val() );
           
    });
});