[BioC] Help downloading limma into R

[Michael Stapelberg]

Hi,

My University has installed a block so that I can not download  
packages into R from CRAN. I want to download the package "limma". I  
have downloaded and unzipped the limma zip file onto my desktop. How  
do i install limma from my desktop into R ? Do I use the  
install.packages command ?

Please can someone tell me what to next to the prompt in R to enable  
me to install the limma package from my desktop.

Thank you

Michael.