I have installed the Ultimate SEO URLs v1.3 contribution here: http://www.apexdog.com & it seems to work fine except for an intermittent error that I am getting.

Code:
Fatal error: Cannot redeclare strip() (previously declared in /home/apexdog2/public_html/includes/seo_cache.php:40) in /home/apexdog2/public_html/includes/seo_cache.php on line 40
If you hit the reload button in your browser, the page will load.

Any ideas why I am getting this & how to troubleshoot?

Update:
Problem solved.

The new code
include('includes/seo_cache.php');
if (isset($HTTP_GET_VARS['cName']) && de.....................

was pasted into application_top.php twice