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two simple question

1) i must auhtorize my user to add pictures in discussion,
but i dont want them to use full writing features (as underline or colorful texts), becuz they can abuse it, just the picture
is there any plugin for it, or a simple editor like in that forum
2)as u know there is a auto refresh option in discussions
comments are loaded automatically, applying this funtion in activity page, is that possible ?
so this page can be used as a lite chat room and quality of discussion response may increase
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@remzi
For 1)
Download the button bar plugin (the one on here) and then edit the file buttonbar.php in the ButtonBar/views folder, commenting out or deleting the features you don't want to give your users.
for 2) you could use one of the chat plugins, instead of the activity page as a chat room - I think that would keep your activity table from being humongous.
I may not provide the completed solution you might desire, but I do try to provide honest suggestions to help you solve your issue.
also it is not really "light" to be polling like that.
grep is your friend.