public function MessageYesNo
Prototype:
static [number] function MessageYesNo(szText, szTitle="");
Parameters
szText
the text contained by the message box
szTitle
the title of the message box.
Description:
Tells the client to show a question message box and waits for a response (Yes, No or Close).
Return value:
Returns RESPONSE_NONE (if the user closed the dialog), RESPONSE_YES (if the user clicked on the "Yes" button), RESPONSE_NO (for "No")