Footer doesn't display centered

[Simon Weel]

We had our website made by a professional company in Joomla 1.5. I made some small changes here and there to CSS and PHP-code. When using Google Chrome's Element Inspector, I found out the code for webpages is quite messy. Don't blame me....

Visit http://www.koppesbouwkunde.nl/ to see our website. Notice the footer. It's displayed centered at the bottom. And it does so on almost every page, except the project-pages. Click a project like this http://www.koppesbouwkunde.nl/index.php ... nes-de-deo and you'll notice the footer is left-aligned. If I use the Element Inspector, click <div class="footer_content">© Copyright Koppes Bouwkunde BV. All rights Reserved.</div> and in the Styles-pane uncheck position: absolute; it moves to the center. But removing this setting fromt the CSS file makes a mess of all other pages....
Anybody have a clue how to fix this?

[sander_v_bergen]

On the home page, the footer (.footer_content) is inside of the div .page.
On the 'projecten' page it's outside of this div.

Are you using different templates for both pages?

[Simon Weel]

On the 'projecten' page it's outside of this div.

Yes! That's it! Thanks!