R help - Feb 2011 - Bonnet-Price CI for difference between two medians

I was wondering if anyone has produced any "R" code for the
Bonnet-Price
95% confidence interval for the difference between two medians?

Refs: 

Price, R.M. & Bonnet, D.G. 2002. Distribution-free confidence intervals
for difference and ratio of medians. J. Statist. Comput. Simul. 72(2),
119-124.

Bonnet, D.G. & Price, R.M. 2002. Statistical inference for a linear
function of medians: Confidence intervals, hypothesis testing, and
sample size requirements. Psychological Methods, 7(3), 370-383.

Or perhaps for an alternative (Bayesian?) credible/confidence interval
for the same problem?

Many thanks,

Andrew Wilson