[access-uk] How do I?...find the size of a folder?

I sure knew how to do this,.. but can't remember now I need it. The folder in 
question contains 151 mp3 files I want to save on cds and would like to know 
how many I need.
I played about in the view menu, checked details and size but this only gives 
me the size of individual files. I want to know how much data is in the entire 
folder.
I plan to use Nero 7 express, use Jaws 9 and Win Xp.
Thanks in advance for any help.
Cheers now,
Marie`

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