I am looking for a Yahoo User Interface programmer to help build custom functionality for my website. The first thing I'll need you to do is write code that adds a custom button to an YAHOO.widget.Editor instance. This button should allow a user to upload a PDF and insert a link to it in the editor. I'll also need you to create various other interesting user interface elements and extensions. Mostly focused on the rich text editor, but I need you to be familiar with all of YUI 2. I'm also...