any add-ons for Image size reduction in a post/thread

[imprezion]

How do I reduce the image size in a post? I have a user that insists on posting these huge photos and creating a scroll bar. Can I restrict them to a maximum width and height in pixels?

How come some forums/boards they can restrict the board size (set a width for the board), even the larger photos, they can end up fit into the forum's width?

My current issue is, the large images wider the thread and post...far to the right side of the monitor..

The attachment manager only restrict the size/file size of the image..and IMG tag won't do reduce image size too,
so How I can setup my board width in order to reduce the large size image?

thanks

--------------- Added [DATE]1193984550[/DATE] at [TIME]1193984550[/TIME] ---------------

got it..just installed the image resizer!.