Learning management system

I want to build a LMS website with the following functions: * teachers can log in and add topics for their class(s) * teachers can add quizes in multiple choice/true and false format (not in flash but in javascript) for each topic * teachers can add tests (similar to quizes) but with time limit (set by teacher) and one time use for each topic * teach can add video(s) for each topic * teachers can add worksheet(s) as html pages for each topic. These worksheets can be edited like a basic word processor with ability to add pics, mathematical formula, then preview and publish worksheet. * teachers can view results of quizes of the students in each class for each topic. * students can log in and register for a course. Teacher must approve students for them to enrol. * *Students can access quizes, tests, video, worksheets for each topic