Take a look at the "Bar chart zero line" section here:
http://code.google.com/apis/chart/styles.html#zero_line

Here's a quick sample:

http://tinyurl.com/mxc3o6

http://chart.apis.google.com/chart?
chs=320x200&
cht=bvs&
chd=t:60,40,70,30,80,20&
chp=.5&
chxt=y&
chxr=0,-100,100&
chm=h,000000,0,0.5,0.5

Have fun,
K
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