The maximum upload size is determined by 
two settings in <code>/usr/local/lib/php.ini</code>
<pre>
; Maximum size of POST data that PHP will accept.                           
; cxh: 10/2/08: reset to 8M                                                 
; If you change this, change upload_max_filesize                            
;post_max_size = 8M                                                         
;post_max_size = 15M                                                        
post_max_size = 20M
</pre>
and
<pre>
; Maximum allowed size for uploaded files.                                  
; cxh: 10/2/08: reset to 8M                                                 
; If you change this, change post_max_size                                  
;upload_max_filesize = 2M                                                   
;upload_max_filesize = 8M                                                   
;upload_max_filesize = 15M                                                  
upload_max_filesize = 20M
</pre>

If you change <code>/usr/local/lib/php.ini</code>, then
run
<pre>
/etc/init.d/apachectl graceful
</pre>
See also <a href="http://embedded.eecs.berkeley.edu/dopsysadmin/faq/49.html">Restarting the website</a>

<p>To check the current size, go to option -> View PHP Info, which will query PHP about its settings.