SVM distance

Hi,
I am using SVM from e1071 package. I am using RBF kernel. I would like to 
know how I can get "d", the perpendicular distance from a datapoint to the 
hyperplane, that SVM calculates in higher dimensional space to classify it. 
Although, this is not something that people usually use, but for my case I 
like to do something with that distance. Does anybody have any idea how to 
get  it?
Thanks.
Raj