It does not work calendar arrival date, departure date

Problem following when selecting " date of arrival " and then you can not select " date of departure " as it does not become active ! Conversely, the same ...
For example, you choose the date of arrival 10/29/2015 and wish to change it but you can not ...
How to fix this ? Please help !
See the problem is possible here : olymphotel.ru/hotel.html
[hr]
Версия Solidres 0.9.2.Stable
Joomla! 3.4.5
PHP 5.6 "Connected on : ctype, curl, dom, filter, gd, hash, iconv, json, mbstring, mysql, mysqli, session, simplexml, sockets, timezonedb, xml, xmlreader, zlib"
Additional server modules on: auth_module, rewrite_module, deflate_module, expires_module, headers_module, limitipconn_module, userdir_module

UP Help ....