The math for this is luckily just algebra and doesn't require any
complex trig or calculus, and there are a few different ways to do it.
This might help you on your way:
http://www.darronschall.com/weblog/archives/000054.cfm
looks perfect, thanks!
jon
--
jon bennett
t: +44 (0) 1225 341 039 w: http://www.jben.net/
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