A JavaScript rich-text editor

A JavaScript rich-text editor (RTE, WYSIWYG), which will be used in an online tabbed chat. The editor must have following features: * Basic text formatting: bold/underline/italic/font size/font color/font family * Has an emoticon tool - similar to the one in this online editor: [login to view URL] (last tool: Insert icon), the list of emoticons will be defined in a configuration file. each emoticon will be represented with a specific string (i.e.: ":)" for a smiley face emoticon), writing the emoticon-string in the editor will auto-replace with the emoticon image (similar to MSN Messenger) * Output: XHTML and BBCodes ( [login to view URL] ). we also need a server side PHP script that converts the BBCODEs back to XHTML. * Will support multi-instances of the editor, and has to work with jQuery UI TABS plugin ( [login to view URL] ) - each instance of the editor will be placed in a different tab (A testing page will be provided). * Must "live in peace" with the jQuery javascript framework - preferable to be written using jQuery * Must be as lightweight as possible, and CSS based (all styling related configuration will be done in a CSS) - If chosen to built the editor over an existing editor - all unrelated code must be stripped out. * Has to support multiple languages (texts will be taken from configuration files), and utf8 text. * Methods that must be included: set content to the editor/clear the current content/get the current content in XHTML/get the current content in BBCodes. * Fast loading time * Cross browser - must support the major browsers: IE6, IE7, Firefox, Safari, Opera, Google Chrome * The code must be readable and editable * The output must pass W3C's XHTML validation