Plotting frequencies as a tree diagram

Hello,

I would like to plot the frequencies of a bunch of categorical variables--the 
results of a cross-tabs, I guess--as a tree diagram. I've been playing with 
the tree package, but I don't want to estimate or predict anything--I don't 
have a response variable. I just want to show, visually, how candidates for a 
study have been excluded from a final study population. Any suggestions?

Thanks!

Tanya Murphy