.htaccess redirect query string

[cheshire]

Anyone know how to redirect a query string. For example I'm trying to redirect

www.site.com/home.php?cat=20

to

www.site.com/folder/

and

www.site.com/home.php?cat=30

to

www.site.com/folder2/


Thing is I don't want to redirect every hit to home.php just ones that match certain query strings. I've tried a RewriteCond {&QUERY_STRING} in .htaccess but I keep getting 500 errors. Can anyone help me with the syntax?

 

[AdamC]

RewriteEngine On

RewriteCond %{QUERY_STRING} cat=20
RewriteRule ^home.php$ folder/ [L,R=301]
RewriteCond %{QUERY_STRING} cat=30
RewriteRule ^home.php$ folder2/ [L,R=301]

should do it

 

[cheshire]

Thanks that did it!