[BioC] unable to install bioconductor package

[mandar [guest]]

I have installed R(version 2.15.1)and want to install bioconductor package,whenever I execute the command :-
source("http://www.bioconductor.org/biocLite.R")
 I am getting following output.plz help me out resolving this issue.plz note I am using proxy connection.

 -- output of sessionInfo(): 


> source("http://www.bioconductor.org/biocLite.R")
Error in file(filename, "r", encoding = encoding) : 
  cannot open the connection
In addition: Warning message:
In file(filename, "r", encoding = encoding) :
  unable to resolve 'www.bioconductor.org'
> 


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