Refreshing xml Calendar

ok, so i am building a calendar for a baseball team site that i am doing using xml.
I made an xml file for each month of the season and all the games played in that month are in that xml file. I can also track the game as it is going on inside the xml file, but have had trouble updating that information. Right now i am using setInterval to update the data shown. However, when it goes to refresh the data it messes up the other months of the calendar and shows the month that i refreshed, or another month. I was wondering if there was a way to be able to refresh just that one xml file, and not all the other ones within the movie. Thanks for your help