I create a Layer element in .xml as below:
```
<layer name="logo_btn"
keep="true"
align="lefttop"
url="%SWFPATH%/skin/icon.png" crop="0|282|190|80"
width="100" height="80" scale="0.7" x="6" y="6" />
```
How can I set the width and height in mobile and pc,
such I want the 100px in mobile and 200px in pc,
or use the media query @media and screen (max-400px) {...}