[Gareth Bowker]

the only thing that springs to mind is that most javascript snippets have javascript: in front of them e.g. onClick="javascript:history.go(-1);return true;" .

You do not use the "javascript:" for standard events, like onClick. You would use it in the value of an href - e.g. <a href='javascript:doSomethingSpecial(this)'> Cheers, Tom P