> function open(page)
> {
>   window.open(http://www.domain.ext/ + page + 'html');
> }
> <a href="#" onclick="open('somepage');">Link</a>
> 
> 
> I realize this is difficult for httrack to parse. Is there
> any setting I can tweak to make it work? Or is there any
> other website copier which can handle complex javascript?
This is too complex for HTTrack, which only supports simple 
parsing and does not execute any javascript.

I think there is another mirroring tool with a javascript 
engine inbuilt--you've have to search around.