URL Redirect issues

Perhaps you can help with redirect issue:

*url “mydomain.com” — needs to redirect to sub dir “mydomain.com/shopping”

using SimpleCart/thematic/WP-ecommerce

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Here’s what I’ve done and results:

*Since both WP and Blog are located in “../shopping”, this is the dir I’ve entered in “wp-admin/settings”

Option 1: redirect/forward domain in 1and1.com control panel from “mydomain.com” to “mydomain.com/shopping” == Error “The page isn’t redirecting properly”

Option 2:
When using “…/shopping” as the home dir, themes disappear and get 404 errors if clicking to a different pages.

thanks in advance!