Update jquery.expander.js

![Screen Shot 2013-04-01 at 5 32 01 PM](https://f.cloud.github.com/assets/1790922/324081/1bac3000-9ad9-11e2-8682-14fd2a249e8e.png)
![Screen Shot 2013-04-01 at 5 32 11 PM](https://f.cloud.github.com/assets/1790922/324082/1bc9fa9a-9ad9-11e2-8dbe-5acce92bca2f.png)

my change fixed this.