Always-on-top header

I want to add a always-on-top header like the new twitter does. Explanation开发者_开发技巧: When the user scrolls down the page, I want the header to stay on top of the window.

Somebody know a script that does that? Or can target me how can I do it?

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You can use position: fixed; on the header.

<div id="header">
content goes here.
</div>

and the CSS:

#header { position: fixed; z-index: 9999; top: 0; left: 0; }

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You need to give your header a position of fixed to make it visible throughout the page. And set the top value appropriately along with width.

Example:

#header{
  position:'fixed';
  top:0;
  width:800px;
}

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Use position:fixed on the header in its CSS.

Also, dont forget to set the left and top attributes to where you want it to go :)