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content module comes with a copy of fckeditor, the author of content module integrated it well.
about FCKeditor itself, this is what i saw in fckconfig-xoop.js:
// The following features need further treatment for XOOPS sites.
// Before I could do better, just leave them there
// Or, help me
FCKConfig.LinkBrowser = false ;
FCKConfig.ImageBrowser = false ;
.
.
that's what preventing you from seeing the "browse server" button.
solution? sorry, i'm looking for one as well....