Fatal Errors: Plugin Related

I disabled a plugin (Sexy Bookmarks) and now on each page I get the following error:

Fatal error: Call to undefined function is_ie6() in /home/fhlinux131/t/teamstudent.com/user/htdocs/wp-content/plugins/sexybookmarks/sexy-bookmarks.php on line 13

I can’t even load admin pages, though the dashboard I have open seems to work it won’t let me switch pages.

Is there anyway I can re-enable the plugin please without having to navigate to the plugins page? I have FTP access etc.

Thanks.