Keeping old pages, not visiting new pages

[climaxphoto]

have got a huge problem! I was hired by a photo company to redesign their website. Done! And it's much better, designed with SEO in mind with much better, easier to find content.

Great! I thought :o(

Yahoo remembers EACH and EVERY page on their old site, but hasn't touched my new site (live since 8/02). I managed to do a sneaky 404 redirect to our
front page if someone clicks on one of those old, obsolete links -- but if someone is looking for a specific product and get the flashy homepage, they
leave.

I know they never paid for a placement, and we are
not listed in the directory either.

My question is:

1) how are we showing up on the Yahoo! searches at
all?

and

2) how do I get them to re-index our site????????

DESPERATE IN TENNESSEE!!!!