legend in image()

Is there a way to add a legend to an image plot? 

System info:
Linux slackware
R Version 1.5.1  (2002-06-17)
ESS 5.1.21
Emacs 21.2.1
-------------------
Colleagues

Is there a way to add a legend to an image plot? I don't see any 
reference to legends in the documentation (so I suppose the answer is 
no?). Although the documentation says image takes plot() parameters, it 
isn't clear to me how the usual use of legend in a plot command would go 
for image(). Perhaps you need to specify 'breaks' and then use something 
like:

legend(x,y, breaks, c('label1', label2'...))
?

Here is my function call at the moment without a legend:

  image(time.h, z, -log10(t5),
         xlab='hours', ylab='depth m',
         col=rainbow(20),
         main = 'Chatham Rise DVM',
         yaxt='n', zlim=c(2,6.5), cex=0.5)

Thanks in advance,

Sam

-- 
Sam McClatchie, Research scientist (fisheries acoustics))))))))))
NIWA (National Institute of Water & Atmospheric Research Ltd)
PO Box 14 901, Kilbirnie, Wellington, New Zealand
s.mcclatchie at niwa.cri.nz
Research home page <http://www.smcc.150m.com/>
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