technical problems

Is there a best browser to use to view these online tutorials?  I am using a mac, OS 10.5, with a Safari browser.  I am encountering two problems:  

In the vocabulary tab, the flashcards do not play audio when I click on the audio icon.

In the vocabulary tab, the concentration game shows all cards upside down. I can't see any of them.  When I click on one, it reveals the character or english.  When I click on another card, of course it tells me I made the incorrect choice, because the card is upside down. I can't see the surfaces of the cards to connect them.  I just can't figure out how the end user is supposed to play this game if she can't see all the cards?  The only thing I can think is that I need to use another browser?