Hi Gareth, i'm using this as my editor of choice. I'm open to new ideas but I need something that is licensed under MIT not GPL/GNU.

Pretty much I have modified this editor so when the user clicks the insert image button, an overlay opens up. The overlay is a customized Thickbox but the core is thickbox still. Anyways the overlay is an iframe. Here the user enters the URL and so forth and they click done button. A string is generated which I need to send to the editor but have no idea how to go about it.