Why DID NOT OMap work by IE?

I found today the reason why my old OMap DID NOT work at Internet Explore. The reason was so simple that I fixed it and now OMap works by IE too. OMap finds out div tags containing blog posts by searching all div tags in the page and checking their class attributes. OMap did it by getAttribute("class"). This works at Firefox, but it doesn't at IE. The solution is getting class attributes by node.className. This works for both Firefox and IE. I found this during testing OMap 1.1. I will announce OMap 1.1 in another post. But before that I have to clean up the new code.

Internet Explorer 7 Release Candidate 1

In order to be fair to Microsoft, I have installed IE7 RC1. But still I can not see any maps on this site by IE.