Changing where top sends you on home page

[Cut-Rite]

Here is my deal.

I have a domain with hosting example 123.com and now I purchase another name 555.com and instead of purchasing hosting again I purchase the option to have the page forwarded to 123.com/555 or whatever.

 

This is my problem.

Everything on the Oscommerce works fine.

When users click on TOP next to catalog they are sent back to 123.com and not 555.com. If they click on the OsCommerce logo that works fine.

How can I fix this.

Thanks,

Scotty