Apply width of select element to stylect replacemnt.

In custom forms, where select's may be smaller or bigger than the default 320/400px the stylect elements will break the layout.

For example:
![stylect issue](http://img690.imageshack.us/img690/1539/stylect.png)

You have to apply the select elements width to the stylect replacement, then it works fine.
![stylect correct](http://img14.imageshack.us/img14/1976/stylect1.png)