rel tag and yahoo backlink

Rel tag not working with yahoo backlink.

[etechraj]

Hi everybody!

I used rel tag in one of my site but It seems yahoo and Altavista don't consider this tag.

Google and MSN is ok. But yahoo and Altavista still showing the site [yourdomain.com...] in backlink after using rel="Nofollow".

Here is code what I have used

<a href="http://www.yourdomain.com" target="_blank" rel="Nofollow"><b><font color="#0033FF">Click Here</font></b></a>

Can someone advice?

Thanks in advance.