Probably best easiest to expose them as properties of your page (or master page if used on every page) and reference them via page directives.

 <script type=text/javascript>

     var userID = '<%= UserID %>';

     var courseID = '<%= CourseID %>';



     .... more stuff....

 </script>

Then set the values on Page_Load (or in the Page_Load for the master page).

  public void Page_Load( object source, EventArgs e )

  {



        UserID = Session[userID];

        CourseID = Session[courseID];

        ...

  }