Hi. Rendering the image is not the main issue: the image tag generated by CodeCogs equation editor will create the equations you need (with better quality than mimetex btw).

The work we need to do is: 1) Add a button to the TinyCME toolbar to launch the editor 2) Get the equation back into the text within your edit. 3) An ideally, make it so you can double click on a equation within the editor and relaunch the equation editor.

I'm fairly certain my previous post above covers the bits to solve the first 2 issues. (3) is harder.

As I said, if you can be patient I'll try to find time to write this addin and create a like demo!

Cheers.