> I downloaded a site and got 51 errors, most of them were 
> file not found which were gifs. However, when going to 
the 
> original site, the gifs were in place.
> Is there a way to 're-mirror' the errors, or go and fix 
the 
> errors without having to download the whole site again

You can try 'Update an existing website' ; but if the 
engine did not found images the first time, I doubt this 
will work the second time. 

Generally this problem is related to the use of dirty 
javascripting in the page, or malformed BASE HREF tags.