requirements to use ajax in 3.0/3.5 with vs2008

We have a requirement to use ajax in wither 3.0 or 3.5 with vs2008 and language C#.
Could you please let me know which version of ajax i need to download, and also if there are any other things to download. Please let me know.

Also our current IE browser  version is 6.0, is this compatible or do i need to install any new versions of the browser.
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AJAX is built into that version of the framework.
If you wish to use the AJAX Control Toolkit, you can download it from

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IE6 is fine. As far as the browser is concerned, its just javascript. I routinely use ajax .net on IE6, IE7 and FF2 with very few problems.
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