improve ui about screenshot

![7a0f6518bd88278160b92827210add87](https://f.cloud.github.com/assets/931554/1102960/e76b3d04-1873-11e3-8ac0-50dffe327e35.png)

![1](https://f.cloud.github.com/assets/931554/1102961/eb953678-1873-11e3-9c29-90aef627f398.png)