Question

UPDATE: Finally I found the solution, it was totally my fake. There were an iframe tag on the site, and in the external file I didn’t include jQuery.
But I learned a lot from your answer and checked my code a lot of time. 🙂
update END.

Firebug console issues the following error message:
$ is not defined
ajaxlib.js()ajaxlib.js (line 6)
[break on this error] $(document).ready(function()

But jQuery works perfectly on my page.
I include the jQuery source in the first script tag (it was the most commonly suggested solution), so it’s should be loaded.

Any help appreciated.

<script language="javascript" type="text/javascript" src="js/jquery-1.6.1.min.js"></script>
<script language="javascript" type="text/javascript" src="js/advexpad_lib.js"></script>
<script language="javascript" type="text/javascript" src="js/ajaxlib.js"></script>
<script language="javascript" type="text/javascript" src="js/highlight.pack.js"></script>

Answer 1

Try changing all $ characters with “jQuery”. They are possibly conflicting with an other library you are including.

as in;

$(document).ready(function() {} );

to

jQuery(document).ready(function() {} );