How to TDD JavaScript so it thinks it is in a browser.

Hi all,

How can I set up some programmed tests to test JavaScript, so it thinks 
its in a browser?

The JavaScript code modifies the style objects and the DOM.

Have tried various utilities that claim to test JavaScript in the 
browser, and they have
proved impractically slow. (A paste of a 25 character string took over 3 
minutes!)

So I guess the JavaScript has to be run elsewhere (WSH?) and made to 
think it is in a browser,
but I have no ideas how to do this.

I can use Windows or Linux - (No mac :( ).

Thanks

Ian