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The solution shouldn't be too difficult, but needs deeper thoughts ... e.g. in which modules is the avatar used? (which you use?)
Btw, are we talking about XOOPS 2.0 or 2.2?
I am not very familiar with the version 2.2, but in version 2.0.* it would be a lot of hacks into the module/block php files.
The path of the file is usualy (system blocks, newbb) shown similarly to this:
Quote:
'avatar' => XOOPS_UPLOAD_URL.'/'.$userinfo['user_avatar']
...so you guess that you would have to change all the avatar-cabable-to-show blocks/module/template files ... it would be a quite hack ... not talking about the possible database problem, because there is 30 characters limit to the name of the uploaded image - and that probably wouldn't be enough for linking images from some websites...
But still ... it wouldn't be a too big deal hack ... one would just have to remember with every version update to change the updated files...
It's up to you...
Happy xoopsing...