I write a little CSS for this chat bar issue in iPad/iPhone.

( iPhone screen with chat bar issue )

It will hide the chat bar in iPad/iPhone. You can't use chat in iPad/iPhone anyway since it built with Flash. 

This CSS only check the screen size not really iPad/iPhone. I think it doesn't affect the desktop browsers which I haven't do the full test, only tested some of them and it seems fine. 

/* iPad [portrait + landscape] */
@media only screen and (min-device-width: 768px) and (max-device-width: 1024px) {
   #xgDock{display:none;}
}

 
/* iPhone [portrait + landscape] */
@media only screen and (max-device-width: 480px) {
   #xgDock{display:none;}
}

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