[R] Placing the legend 'dynamically'

[T.Wunder at stud.uni-heidelberg.de]

Hello,

does anybody know which command to consider when I'm trying to plot a  
stacked barplot with a legend at the most empty portion of the graphic?
I've searched for it, and somebody stated to use the labcurve-command,  
but I don't know how to produce stacked barplots with it.
Is there any possibility to plot a legend box "dynamically" (= in an  
empty region) with the legend()-command?
That would be helpful, because I'm already using this one.

Thank you,

Kind regards, Tom