I've took a look at it and it seems that the jsCalendar language files are incorrect. I've only tested the dutch and english one, so is it correct that you are trying to use a different language then english or dutch?
I have not looked into this in detail yet, but we need to keep in mind that a lot of people already have their own multi-lingual systems for their site. Whatever lanaguge settings jsCalendar uses will need to be able to be overridden by the developer, like FH's own language system.
i have dowloaded and update the jscalendar, but the problem is always present (also in my language, italian), for now i wouldn't use this field.
I not look good but i think that the problem isn't the languages but something about the implemantation of the visualization of the grid-calendar.
I look better the problem.
I resolt it retransleting the original english language file in my own language and now it world good.
i find in my language file dome error.
Yes, this is a known problem. The guys of the jsCalendar didnt translate or changed the language files, so the jsCalendar only works with english and dutch (I translated the dutch version)...