Why would jquery return 0 for an offsetHeight when firebug says it's 34?

Question

So I have a div whose content is generated at runtime it initially has no height associated with it. When it\'s generated according to firebug and from what I can alert wit

Answer 1

Loading this file with a valid IMG SRC gives 3 alert boxes of "37". Without valid IMG SRC it gives "17" on all three. What version of Jquery are you using? And which version of FireFox/IE?