The traditional addon to rip images in sites like Imagevenue, Imagebam, etc is the ImageHost Grabber
https://addons.mozilla.org/en-US/firefox/addon/12249/, however the Pimpandhost site usually is incompatible with this addon.
The alternative is:
1šstep - install the DownthemAll
https://addons.mozilla.org/en-US/firefox/addon/201/
2šstep - install the DownThemAll AntiContainer
https://addons.mozilla.org/en-US/firefox/addon/12577/
Now you can rip the images of the imagehost sites with the DownThemAll, without the problems with the Pimpamdhost site.