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Right now we are generating PNG graphics using a Ruby library, but I'm looking to move to either Flash or Javascript-based charts.

What are the advantages/disadvantages of Javascript charts vs. Flash? Are the JS charts compatible with Safari and IE? (have had other javascript compatibility issues with them so far)

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one big advantage of js/canvas/image based charting as opposed to flash based is that all of the former work on the iphone. chartwidget was running on the iphone a month after it was released, more than a year before the app store was released. Flash based charting still can't do that.

Most of the examples are compatible with IE6+ which is encouraging...

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