ajax and show FAQ problem

ajax and show FAQ problem

hi
i have a problem :s
i need to modify my webstie , and i don't know where to begin :s emm my problem is that i want to use ajax like this for example for the FAQ

Question1 ( here when the user click on it a request will be sent to ajax.php with post parameter id=1 and function = faq , and get the answer and show it under the question )
Question2
Question3
Question4
Question5


and when user click on another question the previous answer hide again and so on :)
i hope you got the idea
i read the documentation but it is been so hard for me to do it
 i am good with php but really bad with html and js

help me plz