Create a htaccess file. This is a text file which the filename starts with a period. After you save the file on your system as say text.htaccess, after you upload the file just rename it to .htaccess. The reason to do this is some operating systems like Windows XP does not support file names starting with a period.
In the file just type,
Redirect permanent /index.html http://www.natelandcompany.com/catalog/index.html
The first name can be relative but the last name has to be absolute and there is a space between the two names.
If your index uses a different extention such as php then just make the changes to the above.
Hope this helps,
BTW there is now an option in the control panel to create an htaccess, look it over and see if it can help. Though I beleive you will end up using the above.