php - Need help on Mod Rewrite .htaccess parent folder and 1 subfolder -

i not on understand .htaccess rewrite, , 1 give me headache.

i have domain.com , , 1 folder called: app/webroot/

1. i want everything: domain.com/* rewrite folder domain.com/app/webroot/*

2. then make me crazy. have 1 folder admin, called "system" under domain.com too. under domain.com/system not rewrite webroot.

3. and finally, want system/something rewrite /system/index.php?subpage=something

really sorry if guy think easy , can not it, stuck whole days already.

here have tried do:

rewriteengine on  rewriterule    ^(.*)$ app/webroot/$1 [l]  rewritecond %{request_filename} -s [or] rewritecond %{request_filename} -l [or] rewritecond %{request_filename} -d rewriterule ^.*$ - [nc,l]  rewriterule ^/?(system)/?([^/]+)/?$ /system/index.php?subpage=$1 [nc,l,qsa] rewriterule ^/?(system)/?([^/]+)/([^/]+)/?$ /system/index.php?subpage=$1&action=$2 [nc,l,qsa] rewriterule ^/?(system)/?([^/]+)/([^/]+)/([^/]+)/?$ /system/index.php?subpage=$1&action=$2&param=$3 [nc,l,qsa] 

nvm, got it.

rewriteengine on  rewritecond %{request_filename} -s [or] rewritecond %{request_filename} -l [or] rewritecond %{request_filename} -d rewriterule ^.*$ - [nc,l]  rewriterule    ^(.*)$ app/webroot/$1 [l]  rewriterule ^/?(system)/?([^/]+)/?$ /system/index.php?subpage=$2 [nc,l,qsa] rewriterule ^/?(system)/?([^/]+)/([^/]+)/?$ /system/index.php?subpage=$2&action=$3 [nc,l,qsa] rewriterule ^/?(system)/?([^/]+)/([^/]+)/([^/]+)/?$ /system/index.php?subpage=$2&action=$3&param=$4 [nc,l,qsa]