class SomeClientClass
{
....
	void logout(int serviceType)
	{
		switch(serviceType)
		{
			case YAHOO:
			{
				ChatManager.logoutYahoo();
				break;
			}
			case MSN:
			{
				ChatManager.logoutMsn();
				break;
			}
			case GTALK:
			{
				ChatManager.logoutGtalk();
				break;
			}
		}
	}
}