[jQuery] No ajax methods working in IE7

[ferdjuan]

I wrote a simple little quick contact form using $.post, it works fine
on every browser INCLUDING internet explorer 6, however 7 crashes
instantly when you click submit. To test and see if it was just my
script that was bad I opened http://book.learningjquery.com and went
to the section on Ajax references where it lists every ajax method and
an example button to instantiate each one, none of which work in IE 7.
Please help!