How to switch label font from Chinese to English

Hi

I tried to plot something simple

x=c('2010-08-20', '2010-08-30')
y = c(1,2)
t = strptime(x, "%Y-%m-%d")
plot(t,y)

At the xlab, the fonts are Chinese.  How can I switch it to English?  I am
working under Windows 7 64 bits Home Edition and R is Win32 version 2.11.1

Is this covered by the Windows FAQ at
http://cran.r-project.org/bin/windows/base/rw-FAQ.html

especially Qs 3.2 and 3.3?  (We don't know what you see in Chinese.) 
I suspect the issue is the locale category LC_TIME which is used to 
'print' date-times (and in my UK locale I get an x axis annotated ny 
'Aug').  If I do

Sys.setlocale('LC_TIME', 'zh_CN.utf8')

[1] "zh_CN.utf8"

plot(t,y)

I get Chinese labels ....

If so, you can also use a different format for the annotations: see 
?axis.POSIXct, e.g.

plot(t, y, format='%m/%d')

Thanks!

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