$('#divexample).load("/MathjaxTesting.aspx", function ()
{MathJax.Hub.Queue(["Typeset",MathJax.Hub,"divexample"])});
The INCORRECT way would be
$('#divexample).load("/MathjaxTesting.aspx");
MathJax.Hub.Queue(["Typeset",MathJax.Hub,"divexample"]);
since the contents of the divexample element might not have been
loaded yet when the MathJax.Hub.Typeset command is performed. It
might work, depending on the timing of the load, and the contents of
you cache, but there is no guarantee, and it may well not work for
some or all of your readers.
Davide