当用户离线时，如何在webview中禁用Skype通话按钮？

I use Skype integration in my iPhone app by using html. When i load a page it will show whether the user will be online or offline. When i press ONLINE button my app will be closed and Skype will be open. But, when i press OFFLINE button it will happen the same thing like that above.. I used the following code for designing skype button in webview to show the skype online status of user and for skype calling.I use Skype integration in my iPhone app by usi