<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^([a-zA-Z0-9_]+)$                   ./bbs_shorten.php?bo_table=$1
RewriteRule ^([a-zA-Z0-9_]+)/([0-9]+)$          ./bbs_shorten.php?bo_table=$1&wr_id=$2
RewriteRule ^([a-zA-Z0-9_]+)/([0-9]+)/([0-9]+)$ ./bbs_shorten.php?bo_table=$1&wr_id=$2&c=$3
</IfModule>