http://arshaw.com/fullcalendar/

or

http://jquery-week-calendar.googlecode.com/svn/trunk/jquery.weekcalendar/full_demo/weekcalendar_full_demo.html

JQuery makes what used to be very tedious javascript features a few simple one liners. An added benefit is it is pretty much cross browser compatible. So you don’t need to code
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Great little jquery addon to handle parent child relationships and sortable lists.

http://bitsinashortbit.wordpress.com/2007/07/22/nested-sortable-jquery-plugin/

This was written for jquery 1.1.x so if you have any issues with jquery 1.2.x or higher in IE which only allows dragging of objects once. Either downgrade jquery or download idrag_source.js from this post
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