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TinyMCE have something like this, but yeah, it should be a easy-access function.

The only downer for me : it uses JQuery, which I often avoid in admin pages.

Same question here. http://www.ourtuts.com/34-outstanding-admin-panels-for-your-... are all made using Jquery. Why you want to avoid Jquery in admin panels?

Why?

Simply because my admin pages don't use a lot of JavaScript. Some Ajax, some image resizing... straightforward stuff, no need of a library.