in Chapter 2 - Ajax Basics/HiddenFrameExamples/GetCustomerData.php, line 12 seems to be missing a closing bracket and should be:
Code:
if (is_numeric($sID)) {
this was puzzling me for a while - hope it might help somebody else!
EDIT: ok, oops somebody already reported this on page 2, sorry for the "double" post :)
error report