This works for me....
<input type=button value="title" onClick="document.title='New Title';">
IE 6.0 on Windows Server 2000....
Please note I removed the word "javascript" from your onClick event.
Programming today is a race between software engineers striving to build better and bigger idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning. - Rick Cook (No, I'm not Rick)