I have posted this SO question.
I have been very grateful for the help I have received particularly from iivel. Unfortunately for my particular problem I was barking up the wrong tree so to speak - turns out the ajax problems were due to an error in my PHP.
The advice given and explanations of the AJAX process were very helpful to me (although have probably been covered to death by other people.
So my question is, what do I do with this question?
I see four options:
Delete question - though one answer was upvoted so not sure if I can do this.
Answer my own question with slightly irrelevant answer explaining the situation and advising others to check the same thing.
Edit iivel's answer with an update and what the problem is.
Accept the irrelevant answer and explain in the comments.
Any advice as to what I should do here?