Well, PHP Strip Tags is whats eliminating the HTML tags (as it should) in the description, but is left with the script content as post content (as the content is not comprised of HTML tags); are you allowing users to post HTML code? It's extremely dangerous if so...

The BBCode system generally has most tags that users could need to make posts (most formatting options) and you could make a custom bbcode (in the editor in the Control Panel) if you needed to extend the system (though, again, I woudln't allow users to post any JavaScript).

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