pepelsbey/shower — pull request #73 by ai (2012-03-26 18:05:58+00:00)
Title: Fix issue on presentation load

When I load [example presentation](http://pepelsbey.github.com/shower/en.htm) i have error at `script.js:58` in Chrome 18.0.1025.113 beta:

```
Uncaught TypeError: Cannot read property 'id' of undefined
```

This is quick fix of this issue.