Indexed pages disappear

[alfanhendro]

My site, http://www.sg-house.com is a modified phpbb forum. I change it to make it easier for people to post in, sort of online classified. Currently, there are about 200 over posts from the users.

I installed a few mods:
- Able2Know Search Engine Optimization Mod
(I changed the htaccess rewrite, to disable sid only for search engines, as I allow guest posts)
- Printer friendly mod
- I can't remember what is this: http://www.sg-house.com/sghouse/

Things goes well until around end of last week. Just a week ago the site has a few hundred pages indexed at yahoo, more than actual number of pages. Then suddenly, it drops to just 10 pages indexed. I thought it was temporary problem, but till now the problem is still there.

This is the Yahoo search result
http://search.yahoo.com/search?p=site%3Asg-house.com&ei=UTF-8&rls=org.mozilla:en-US:official&fr=moz3

Any clue?

Thanks.
_________________
Singapore Property Buy & Sell