What's the "easiest" way to implement some real-time trending graph on the web?

What's the "easiest" way to implement some real-time trending plot on the internet?
I want to have five graphs, each graph having four colored dataset.
The four dataset will share a common time on X axis, but will have different Y axis (two Y axis on the left and two Y axis on the right)
Each graph needs to update ever 5 second (unless there's no new data).
User can show historical data from previous 0.1 to 96 hours (selectable), while trending.
Thank you.
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jmc0Author Commented:
Thanks for the suggestions, btw is any that are written in C++.Net (unlikely but just asking)?
No, all the avobe solution are mostly written in JavaScript. But you can use them on your .Net Project. And in the case of Visual c++ .net, I don't think so much flexible solution is available there free. There are some activeX for chart drawing - which are entirely written in Visual C++ .  If you want paid solution then just googled for it - you'll find many.

A free activeX chart drawing control(Visual c++ 6.0) : NtGraph

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