2-Y-axes on same plot

Hi...

Is this possible in R?

I have 2-sets of data, that were collected simultaneously using 
2-different data acquisition schemes.
The x-values are the same for both.
The y-values have different ranges (16.4-37.5 using one method, 
557-634 using another).

In theory, if you plot both plots on top of each other, the graphs 
should overlap. The problem I'm having is trying to have to different 
sets of y-values appear in the same graph, but scaled in the same 
vertical space. I've seen this done in publications, but not sure if 
it can be done in R.