Cache full of spam links?

I was ranking in the top three in Yahoo for some of my target keywords, until today I noticed that I wasn't on the first page for none of them. I was a little curious and couldn't seem to work out why and then I stumble upon my cache.

Somehow my navigation bar has been hijacked, and a load of spam links have been inserted into it. But I never noticed this, and my site is fine right now? Anybody know what's going on, and if this is whats affceting my ranking?

I also noticed that some of the websites source has been very slightly edited, and now there's a few bugs on the site. For instance the footer and sidebar have dissapeared from the post pages?

 

Thats very unfortunate for your site but i'm sure ti will bounce back. Best of luck.

 

Can anybody perhaps put me in the direction of where I can get some help?

 

i have 6060 yahoo links , but they don't help me for rank my site ....why ?

 

That's completely irrelevant to my question

 

wow how the heck did they do that? Is it just in yahoo cache (not google or msn?)

That's crazy, I never saw something like this before..

 

i dont see any problems on your Y cache.

it seems normal to me