[R] help.start() error:

[Christoph Lehmann]

Hi 
I am new to R and just wanted to go through some tutorial. First I tried
to start help, but I got: 

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> help.start()
Making links in per-session dir ...
If /usr/bin/netscape is already running, it is *not* restarted, and
    you must switch to its window.
Otherwise, be patient ...
> sh: line 1: /usr/bin/netscape: No such file or directory
sh: line 1: /usr/bin/netscape: No such file or directory
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how to solve this problem? thanks a lot

christoph