Dirty Page, Save Warning

Does anyone of you have a best strategy to figure out if a page has changed data, before leaving the page. I know about the onBeforeUnLoad event, we tried that, it works for simpler situations. But, we are not able to use that event on heavy testing, it fails for one or other reason. As I know, this is a very common situation in website programming, I am hoping someone will have a fool proof solution
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Here is a good client side methododlogy:



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ryerrasAuthor Commented:
we did implement the stuff in this article before. This doesnt pass all the testing. Anyway thanks for the link
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