javascript - Canvas only drawing in Chrome -

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http://jsfiddle.net/mp4yg/5/embedded/result/

heres plugin i've been working on create hub-spoke diagrams. i've avoided asking questions pertaining far (gonna go ahead , pat myself on one) but, i've hit roadblock...

my functions working great reason in chrome (and partially in opera). i'm using <canvas> draw lines between circles, none of render outside of chrome. want work in @ least ie 8+, , should work in updated ff , safari, etc.

i'm self taught on of suggestions , feedback on code appreciated, although i'm not sure place that.


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