Javascript :: Good Line Graph API Out There With Specifications?

I have data whose primary visual representation is a simple number as aline height, but the rest of the data for a single sample contains much more data. I want to convey this extra information on a html5/flash line graph where each example is guaranteed to be on a single tick, and that the control can drive a click event that supplies the closest tick near the click and the entire associated sample data.[code]The graph would have at least 3 ticks, and if the user hovers/clicks, the extra data of the nearest tick would be shown elsewhere.