Excuse us for the delayed reply. I will try to explain in more detail how the editor's Image Manager works.
By default, the image manager will list all available libraries in the current site. If you want to show libraries from other sites in the same site collection, you can follow George's advice and modify the editor configuration file. For example, if you want to browse the publishing images and site collection images libraries in the root site of the site collection, you need to add the following lines in the configuration file:
Note, that currently you can only add libraries in the ImagesPaths list in the configuration file. It is not possible to browse whole sites. For example, if you have a site called wiki in the root of the site collection, the following will NOT work:
However, you can access libraries in the wiki site if you want to:
If you want to browse the whole sites and not only a list of libraries and your site is using MOSS 2007, then you can switch to the original MOSS asset picker dialog. Simply open the editor tools file (ToolsFile.xml or ListToolsFile.xml, located in the same folder as the configuration file) and rename the "ImageManager" tool to "MOSSImageManager". Note that the original MOSS asset picker dialog is not fully cross-browser compatible, so you might experience some issues in non-IE browsers.
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