Getting ASP.NET Cookieless Sessions and JQuery AJAX to play nice

I have a web site that uses JQuery AJAX. With this JQuery code $.post("/ajax/getsomedata.aspx", {'id': id }, function(data) { dosomething(data); } ); When I run this with cookieless="false", id shows up in Request.Form. When I set cookieless="true", id is no longer in Request.Form.