Opening package manual from within R

I don't think help.start is what I'm looking for but I may be doing  
it wrong.  I tried:

library(tm)
help.start("tm")

This may be inappropriate as it returns:

library(tm)
help.start("tm")

Error in if (update) make.packages.html(temp = TRUE) :
 argument is not interpretable as logical

Just typing help.start() takes me to a web page but I still have to  
search.

I wrote a function to do what I want that I could place in  
my  .First() or a premade package but why bother if there's a way to  
already do this?
#=============================================================
#                                                       FUNCTION
#=============================================================
manual <- function(library){

LIB <- substitute(library)
LIB <- as.character(LIB)
browseURL(paste("http://cran.r-project.org/web/ 
packages/",LIB,"/",LIB,".pdf", sep = ""))
}

#=============================================================
#                                                        EXAMPLES
#=============================================================
manual(plyr)
manual(tm)

Date: Tue, 23 Aug 2011 15:10:51 -0700
Subject: Re: [R] Opening package manual from within R
From: gunter.berton at gene.com
To: tyler_rinker at hotmail.com
CC: r-help at r-project.org

After loading the package, does help.start() do what you want?

-- Bert

On Tue, Aug 23, 2011 at 2:32 PM, Tyler Rinker <tyler_rinker at hotmail.com 

wrote:

Simple question but searching rseek did not yield the results I  
wanted.

Question:  Is there a way to open a help manual for a package from  
within R.

For instance I would like to type a function in r for the tm  
package and R would open that PDF as seen here:
http://cran.r-project.org/web/packages/tm/tm.pdf

-The vignette function exists for vignettes  
[vignette("package.name")] so I assume the same exists for manuals.

-I do not want library(help="package.name") as this is not  
detailed enough.

I am running R 2.14.0 beta on a windows 7 machine
Reproducible code does not seem appropriate in this case.
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