writing autocorrelation and partial auto correlation functions to a file

Dear All,
         I am very new to T.  I need to fit a ARIMA model to my time
series.  So I found the auto correlation functions and partial auto
correlation function in R. Now I want to save these valuse along  
with the
significance levels to a file.  How to do that?.  I tried some  
function in R
like write.table but returns an error  "cannot coerce class "acf"  
into a
data.frame".  The I tried "write"
but returned again an error "Error in cat(list(...), file, sep, fill,
labels, append) :
 argument 1 (type 'list') cannot be handled by 'cat'".
Where am I going wrong