Seamless form fields

When we move beyond the use of prompt() for page creation in the editor, it would be ideal to maintain the user's focus on the file tree. Instapaper has a rather elegant solution to a similar problem:

![](http://37.media.tumblr.com/d3daba58008d96b1e68d2784f47c060f/tumblr_n5ecrfD0bM1qea4hso1_400.gif)
