I changed the upload limit in my .htaccess file in order to upload larger files (3d modeld, etc), When I upload files larger than about 13 MB, however, I get a 'server timed out/reset' message. Is there something else I need to adjust here?

# php 5, apache 1 and 2
<IfModule mod_php5.c>
    # default memory limit to 64Mb
    php_value memory_limit 64M
    # to make sure register global is off
    php_value register_globals 0
    # max post size to 8Mb
    # php_value post_max_size 8388608
    # max post size to 100Mb
    php_value post_max_size 104857600
    # upload size limit to 5Mb   
    # php_value upload_max_filesize 5242880
    # upload size limit to 100Mb
    php_value upload_max_filesize 104857600