i have got rather active forum, and would like to make it look good, but i got problems with big images...

my users tend to paste big images from imageshack, and it really often breaks my site - is there any hope to automagically scale all images to maximum width?

is it possible to scale images when they are posted, or maybe even those that are already posted (by applying filter and editing+saving node, or maybe cron job searching for images and doing some magic tricks)?

thanks in advance for any idea...