Help with mod revrite please

[Trust]

Hi have one problem with my mod rewrite i will be glad if someone can help me.
I tryed last days to rewrite my URL to be more shorten i have like this:
Before to post URL i want warrning this website containt ADULT CONTENT please enter if you have +18 or older.
This link: http://cam4share.com/ladydetails.php?user=chrissniper
I want to be like this: http://cam4share.com/chrissniper
Can help me some one?
Thank you,
Trust.

[Trust]

Yep i solve it:
<IfModule mod_rewrite.c>
Options +FollowSymLinks
RewriteEngine On
RewriteBase /
rewriterule ^([a-zA-Z0-9-a-z_]+)$ /ladydetails.php?user=$1 [L]
</IfModule>

But i have other problems if someone can help me, i want added more rules but i don`t know how i tryed right that do add one more but not work:
<IfModule mod_rewrite.c>
Options +FollowSymLinks
RewriteEngine On
RewriteBase /
rewriterule ^([a-zA-Z0-9-a-z_]+)$ /ladydetails.php?user=$1 [L]
RewriteRule ^featured/?$ featured.php [NC,L]
</IfModule>
Thank you.