How can i get the calendar links/buttons to keep the Itemid from the url?

[idstx]

I'm trying to keep users on separate calendars and to do this I have to call the Itemid with the calendar. Where do I add the itemid in order to have it in the url when they click on the buttons (example: forward one month, backwards one month, week view, etc)?

Thanks for your help.

[Andy]

Can you provide a link to the site in question?