Is anything not seen is hidden text or link ?

Please look at this site: http://www.allbiz.co.il/,
It has a huge list of links at the header and footer in:
<div class="RedFreeze">
which is:
.RedFreeze{
display:none;
}

which is not seen.
On every page, they have these cross links, probably to boost PR, which somehow they succed. I registered my site there for free and for almost 1/2 year, they were before me in Google, when searching for company name.

So Google accepts that with no problem.

Their ad actually says, boost your Google traffic.

So are these hidden links and are against Google TOC ?

 

Site will vanish from google if reported to goodle.

 

Most likely Google police hasn't seen that

 

These site exists about 5 years already, so can it be legal anyway ?

 

Still, page rank is only 4? I have a decent site with no stunts like this and the PR is 5... better be straight...