[R] How Can I change the acf's plot type?

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In the R Document, the usage of the acf() is as  follow:
  acf(x, lag.max = NULL,
    type = c("correlation", "covariance", "partial"),
    plot = TRUE, na.action = na.fail, demean = TRUE, ...)
But now I want to get the result picture like:
 plot(x,type="l")
 or
 plot(x,type="p")
How can I do this with acf function?

	

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¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡guangxing at ict.ac.cn
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2005-11-28