fixed search textbox

this fix the style and function of the search textbox.

![2013-08-31_23h57_36](https://f.cloud.github.com/assets/658431/1063096/d1fcbdde-1289-11e3-8575-07e8919fd125.png)
![2013-08-31_23h57_44](https://f.cloud.github.com/assets/658431/1063097/d50bcfba-1289-11e3-8760-7e10b32e3055.png)
![2013-08-31_23h57_54](https://f.cloud.github.com/assets/658431/1063098/d777cd94-1289-11e3-80d6-e1c19f60894b.png)


the hover style was different to clear textbox and i think, we don't need the clear text button, because i want to search for the text and don't want to clear it.