Help! Google Traffic to my site Dropped 90%!!!

[cocowomen]

I have modified the footer internal links and title which link to another category on my web page at the bottom of the homepage at 4/21/11. But after that, i find that My keywords(include Long-Tail Keywords) are not showing in google search, and my Google traffic dropped 90% starting on 4/22/11, I don't know what happened? i search and what to find out the answer at google, it said that maybe the over optimization problem. So i remove any over optimisation(links) which i added before. Until now they were not showing up on google.

Any and all advice is appreciated.

Thanks.