ipython/ipython — pull request #868 by Carreau (2011-10-13 19:25:34+00:00)
Title: Warn user if MathJax can't be fetched from notebook closes #744

just put this in notebook.html
```
There was an issues trying to fetch MathJax.js from the internet. You might
wan't to consider using "install_mathjax()" to be able to use the Notebook
fonctionnality offline
```
And hide it at `

`'s `onload` if `window.mathjax` found.