There is a ridiculously simple way to resize forum images. This will only work for images posted into a forum topic. It will not resize images that are uploaded as attachments.
add to style.css
Code:
.postbody img {
max-width: 630px;
width: expression(this.width > 630 ? 630: true);
}
It uses Dragonfly's existing postbody CSS class. Any image within the postbody body class that it outside your max-width property will be resized to the max-width property.
I posted this because a lot of CMS's not just DragonflyCMS, have these long winded resizing scripts that mostly involve javascript. There's no need to make it that complicated. Hopefully in the future HTML5 or above will introduce a way to resize images while keeping the aspect ratio on the fly. Until then, this CSS should suit most forum posting situations. It's not a perfect solution because it won't keep the aspect ratio but it's certainly good enough for 99% of forums out there, especially DragonflyCMS powered forums.