Gmail - How does it do this?

I was using Gmail and suddenly the Gmail Chat window appeared inlined alongside my message.  What got my attention was that the window hovers over the main body of the window without bobbing up and down like so many failed attemptes at Javascript repositioning.  How do they do this?  

Check out the pic here:

The window sits perfectly static above all text beneath it unaffected by the main window's scrolling.

Are they using some special IE6 command or is the Google activex toolbar assisting in some way.

Im using Windows XP Pro SP2 with IE6.

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Its nothing fancy, just some CSS tricks to make the box float above tha page layout.  It works in firefox too.  I'd suggest looking at the page source and any css files it references to see the code that does it.
anistonAuthor Commented:
WHat are the CSS commands to perform this effect?  I know about Position and Float but these wont keep a block perfectly fixed and overlayed over another while scrolling the main window.
Theres some google thing that uses that too.  It's becoming a new fad.  

Check out this code:

<div style="z-index: 1; position: absolute; right: 10px; bottom: 10px; background-color: #cc3300; width: 280px; padding: 10px; color: white; ">Hello World</div>

This would create a floating box which constantly stayed in the bottom right corner of the page. If you just play around with the values you should be able to get what you want!

Hope this helps

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