Javascript linking to other pages

Javascript linking to other pages

We're running over a problem here. We have a website which shows a header,
content and a footer. Now, when clicking on a link we want just a part of
the site (content-part) to be refreshed to save some traffic. The header
and footer should stay as they're. We tried to use the following script
for that:
http://www.dynamicdrive.com/dynamicindex17/ajaxcontent.htm
Well, the script is not doing great on our site. Any other JS-Code does
not get executed at all. The GET-Tags in the URL are not displayed aswell.
Everything else works with that script.
Do you have knowledge about any other alternatives to this script?
Regards,