Pagerank change question

[wmuser]

Hello,

I have a website which is available on two languages.
On index.php i have a java script setup which is based on users browser settings,redirecting him to language 1 or language 2 index page.

My pagerank has changed from PR 6 to PR 5 for two index_language pages but index.php still has PR6.

All three pages had PR 6 for more than 3 years.

Detailed link stats

Index.php had and has PR 6
Sold 4 links,one for PR 0 website,one for PR 4,one for PR 5 and oen for PR 6 website.
One link is for English website and the rest 3 for other languages websites.

I have sold two links on index_language1.php (English websites linking to two English websites)
One website has PR 4 and the other PR 5.

index_language2.php website has the same links as index.php
Sold 4 links,one for PR 0 website,one for PR 4,one for PR 5 and oen for PR 6 website.
One link is for English website and the rest 3 for other languages websites.

Time frame i sold the links - 1.5 months,PR has droped recently.

PR for the rest of pages is remaining unchanged.

Can anyone please tell me if its something normal to happen?

I have these questions

1)Maybe all is because that one PR 0 link

2)I had to sell links in a longer time frame like in 4 months and not place them all at once?

3)Did i had to not sell more than 2 links on each page

4)Is a partcular number of in links needed to earn PR 5 then PR 6 and should i link to a fixed number of websites only?

5) Maybe all is because Google has detected link brokerage company's html code on my website and "understood" that i am selling links?

Best Regards

[ronin100]

I'd say #5 is most likely - it's definitely against GG guidelines - I think it's ok if you put the "no follow" tag in the outbound link. That would make it purely for advertising and not - "for the sale of Page Rank".

Maybe someones with more insight will add to or disagree with this - and will commment further.

Good luck!

[SpanishWeb]

Pagerank is exclusively about Inbound links.

You can be penalised in SERPs, but PR?
PR is about inbound links only.

[tedster]

Dropping just one point in toolbar PR can happen even if your total backlinks go up.That's because PR is calculated on relative scale over the entire web, rather than being on an absolute scale of some kind. It only takes a small shift at PR re-calculation time to make a low level PR 6 become a very high level PR 5.