DHTML Documentation Site

Hello everyone, I need a little help finding a website. A couple of
months ago I found a site with documentation on dhtml, javascript, etc.
It was great because you could look up a specific html object or
javascript function and then in a separate frame it had 3 or 4 tabs,
each with an external sites' documentation on it. So say a picked an
<a> tag, the tabs would have MSDN's documentation on one tab,
w3school's documentation on another tab, etc.

I evidently lost the link when I got a new computer, does this ring a
bell with anyone? Thanks in advance!