checkGuestName handler

This handler is used in non-integrated mode with chat authorization and guest mode enabled. It checks if the login name is available to be used under guest mode.

Parameters:

NAME - user name
Format of the returned data

If login name is taken (in use):

<checkGuestName error="AUTH_ERROR" />

If available:

<checkGuestName>
<photo><![CDATA[http://youdomain.com/users_images/no_photo.jpg]]></photo>
<photoModeImage><![CDATA[http://youdomain.com/users_images/no_photo.jpg]]></photoModeImage>
</checkGuestName>