Sometimes you need to grab specific files off of a webserver. You can use the open-source utility WGET to do this.
wget -r -nd -t5 --limit-rate=10k -H --domains=www.mywebsite.com,media.mywebsite.com http://site.to.download.com/folder -A.jpg,.jpeg,.jpg.1,.jpeg.1 -erobots=off
The above line downloads just images specifed by the -A switch.