R help - Oct 2004 - simulate bivariate life time distributions

Dear helpers,
 
I was wondering if there are some bivariate distribution simulation functions in
any R packages. Specifically, I want to simulate bivariate log logistic,
bivariate Weibull, or other common bivariate life time functions, and I can
specify the correlations. Any comments about this will be appreciated.
 
Thanks,
 
Zhu Wang