R help - Jul 2012 - Reading multiple line from a JSON formatted file

Below is R code that successfully reads the first line of a JSON file
(attached).
However, it is supposed to read 5 lines of the file, not just one.  What is the 
wrong? 

==================== 
>library("rjson") 
>json_file <- "/Users/smcintyremobile/Google
Drive/AAShelby/CORRESP/Services Research/eWoM references for
Ed/yelp_academic_dataset SAMPLE.txt"
>json_data <- fromJSON(paste(readLines(json_file,n=5),
collapse=""))
>json_data 
$votes 
$votes$funny 
[1] 1 

$votes$useful 
[1] 8 

$votes$cool 
[1] 1 


$user_id 
[1] "TFm6azL9LLpljgVKx-Vfkw" 

$name 
[1] "E L." 

$url 
[1] "http://www.yelp.com/user_details?userid=TFm6azL9LLpljgVKx-Vfkw" 

$average_stars 
[1] 3.5 

$review_count 
[1] 12 

$type 
[1] "user" 
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