Hey,

I am using the 5.x version of Drupal and made a mistake whene I installed a template called "Internet Center". Actually the theme isn't fit for the 5.x version, so what happened, I changed my theme to it, and now I can no longer edit my in my 'theme manager'

You see it doesn't go well for my website: http://www.gruitrode.net/site

The error is : "
Fatal error: Call to undefined function: form_render() in /home/httpd/vhosts/gruitrode.net/httpdocs/site/themes/internet_center/template.php on line 93"

how can I manually change my website theme, because I can't do it via the 'theme manager'

Thanks!