I'd say you'd have to apply for a new work permit, since you are actually going to work in a different country, this should be down to your employer if he wants to move to another country.
ya sure, the company will take care of work permit and visa.
What i am worried about is to submit all the documents again for visa...For non-Eu they ask many documents...for which i have to travel home..back to arrange.
Hope only permit is ok..and visa will be renewed.
I assume that you have category D or D+C visa?
In which case, this actually isn't a Schengen visa - these haven't been harmonised yet (why, I don't know) and isn't actually valid for travel within Schengen. As I understand it, you'll need to obtain a new Category D visa for Poland.
But if you have legal residence in the Czech Republic, you should be allowed to apply for the Polish visa at the embassy in Prague. You'll probably have to go there to find out, but I'm fairly positive that the EU tends to regard legal residence of more than 90 days in one Schengen state as enough for this thing.
Let me know the category on the visa and I'll be able to help further - but I'm pretty positive that you'll need to reapply. However, you should be able to apply on the basis of your residence in the Czech Republic, which should simplify things a bit.