As I see, I don't desccribe how menu works. I you choose for example Ceniky from menu the line where is "Komodity Typy zpráv TOP 6x6 Marketingové dokumenty Anketa Produkty eD Ring" this line should change to other.
Site is using window.foo to refer things with id="foo". This is not supported in Mozilla and never has been. This will in fact not work with any browser but IE. Is there a site involved that can be evangelized? If not, this is invalid...
Thank, trying it explain EDlink webmaster, that pages should be usable in all browsers. Hope that change source code.