css and js fixed, closes #225 #224

the changes we talked about yesterday, #225 and #224 

But I have one question: in the groups form, the checkbox 'join group as coach' is now also visible in the edit form.
How can I check if I'm editing a group or creating a new one?
Hm, there seems to be no defer function:

```
jQuery('.alert').defer()
TypeError: undefined is not a function
```

We could just leave the element in the DOM, it doesn't do any harm, does it? When a new alert is shown, there will have been a page reload anyway.