In this case you should use the instructions from my post ->
http://forum.x-cart.com/showpost.php?p=315987&postcount=2
In the welcome.tpl you can use something like:
Code:
{if $user_account.membershipid eq 0}
... no membership ...
{elseif $user_account.membershipid eq 9}
... specific membership ...
{/if}