I can't get the two series of numbers to scale together.

Here is sample code that you can paste into...
http://code.google.com/intl/en/apis/chart/docs/chart_playground.html

cht=lxy
chs=400x300
chd=t:20,30,40|1,4,2|24,34,44|3,7,1
chds=20,40,1,4,24,44,1,7
chxr=0,20,54,2|1,0,7,1
chxt=x,y
chxs=0,ff0000,12,0,lt
    1,0000ff,10,1,lt
chco=FF0000,00FF00
chdl=Apples
    Oranges
chtt=Some+Values
chts=0000ff,24

Translated:

chd=t:s,e,r,i,e,s,1|s,e,r,i,e,s,2|...ors:series1,series2,...ore:series1,series2,...
chds=<series_1_min>,<series_1_max>,...
chxr=<axis_index>,<start_val>,<end_val>,<step>|...

The three varying parameters in question are:
chd=t:20,30,40|1,4,2|24,34,44|3,7,1 chds=20,40,1,4,24,44,1,7 chxr=0,20,54,2|1,0,7,1

Can anyone get this simple example working?

The chart supports multiple series but for some reason I can't scale it so that the values are displayed within scale.

Any help appreciated, Chris