Some changes in HTML5 canvas application

I am looking for someone to fix and add a few things to a HTML5 canvas application. It's a proof-of-concept only. The work needs to be done to existing files. You can preview the files and the application before bidding if you like. Things to be done: 1. make added text to the canvas draggable (to position them on the canvas). The amount of added text is dynamic. 2. fix adding text (on click) it now needs a small drag to be placed. 3. create undo's - inspiration here: [login to view URL] The undo's need to be implemented without any noticable delay in the application and needs to work in IE9, Firefox, Chrome and Opera (newest versions).