how to change default directory by htaccess file
put this code there and get what do you want
DirectoryIndex filename.html index.cgi index.pl default.htm
Redirect /olddirectory/oldfile.html http://yoursite.com/newdirectory/newfile.html
htaccess, which is probably the most effective, considering the minimal amount of work required to do it.
htaccess uses redirect to look for any request for a specific
and put there
Easy htaccess tutorials