Browser Based Code Editor

I need a code editor on the browser. It should be javascript only no applet or activex. Requirements: - syntax highlighting - code completion - Tab key for indentation - [IMPORTANT] Must be JavaScript only (No plugins or ActiveX) The editor should have two data structures which identify keywords for syntax highlighting and for code completion. The keyword structure should identify a css style and the keywords. For example: var keywords = [{css: 'loops', keywords: ['for', 'while', 'do']}, ....]; where "loops" would be defined as a css style class (.loop) on the HTML page. The code completion data structure should be as follows: var snippets = {sendEmail: ['Subject', 'Destination', 'Body'], ....}; The keyboard should be handle appropriately such as the capturing of the tab key for indentation instead of losing focus. The completed project should include definitions for Javascript keywords and a few sample functions for code completion.