Stylehacks

Modified some parts in JS to imitate the styling of a TYPO3-backend-module in v6.2.
Tested with version 6.2 and 6.1.7 with two different backend-skins but only in chrome under Linux.
![screenshot-newsletter](https://cloud.githubusercontent.com/assets/2480602/4337748/6765fb36-4012-11e4-96fd-83559fb89e0b.png)