Language / 'Gateway' slavic language? [54]

There is another constructed Slavic language out there called "Slovianski" (my user name has nothing to do with it, all I wanted to do was say Slavic in Polish because I had no other ideas for a user name ;) ) There are two Slovianski languages, one with easy grammar with no case system intened for western foreigners and one with a case system to be more turely Slavic.

Unlike Slovio one of the Slovianski languages has a simple case system and retains many heart-warming and learnable "slavisms." It uses both the cyrillic and latin alphabets. I don't know if its any good for getting intruduced to slavic languages then moving onto a real one, seeing how I only speak English, some German, and some Polish. I tried learning Polish and failed miserably becuse every time I told the teacher I needed to learn the case system she said I should already know it.

The website is: steen.free.fr/slovianski/index.html

I have a question about Slavic languages - I've asked my babcia and pra babcia this but they were unsure... what is the closest major language to Polish? is it Slovak or Belarusian? They don't speak either of those but are very familiar with them and couldn't decide.