I am new here and I had deactivated my plug-ins in order to update WP to 2.8. Then when my wife activated the plug-in Google Analytical rendered the following error code.

Fatal error: Call to undefined function: is_site_admin() in /home/jaymcgil/public_html/nhviewfinders/wp-content/plugins/sem-google-analytics/sem-google-analytics-admin.php on line 20

Any help would be appreciated. Thanks Jay

One solution: you could just deactivate the plugin and put your Google Analytics code in theme options/HTML-CSS Inserts/Body Bottom.

Thanks Paulae I ended up just going to the server via ftp and deleting the plug-in all together. I couldn't access the dashboard to deactivate the plug-in that is why I deleted it on the server.