[jQuery] Selected value in dropdownlist

[jQuery] Selected value in dropdownlist

Hi folks,
How can I get selected value in dropdownlist?
That code does not work. Why ?
$(document).ready(function()
{
    var test;
    test = document.getElementById("ddlCourse").value;
    $("#ddlCourse").change( function() { $('#class').load('filter_report.asp', {ajax:'1', cod_course: test }); } );
});
<br clear="all">
thanks,
Harlley
<a href="mailto:harlley@gmail.com">
harlley@gmail.com</a>
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