> I use Httack to download a website. When I review it 
> offline, it tries to go online and I don't want this 
> happens. Is there any option to prevent this happens.

This is not httrack, but your browser which tries to go 
online. Try to activate the "No external pages" option in 
httrack (Set Options pannel), this should do the trick.

If it doesn't work, it is probably related to some evil 
javascript inside the page which attemps to load images 
online, and which wasn't detected by httrack.