let's say i found a site www.somesite.com and that 
site has structure like:

www.somesite.com/a/
www.somesite.com/b/
...
www.somesite.com/z/

and under those letters r text files that i want to be 
mirrored...

but i want just few letters to bi mirrored, for 
example from 'b' to 'm' and 't'

what should i do?