Mimetex installation problems

I’ve been attempting to install mimetex in my blog, but with no success.

Originally I got this error message when I attempt to post tex:

Warning: escapeshellarg() has been disabled for security reasons in /home/s/specifiedcomplexity/www/latexrender/mimetex.php on line 40

Warning: system() has been disabled for security reasons in /home/s/specifiedcomplexity/www/latexrender/mimetex.php on line 42

The mimetex.php has a comment suggesting you change a line that reads $system_disabled=0 to $system_disabled=1 if you get a message that system() has been disabled for security reasons, so I did that and so got rid of the second part of the error message. But any ideas about what might be up with the first half?