Update Calender to new version of NoGray(repost)

My oscommerce site currently uses the nogray calender but it doesnt work properly in the latest versions of Chrome/Firefox and needs updating. I believe the latest files are updated here: [login to view URL] An example page on our site where the calender is in use is here: [login to view URL] As you can see the calander has been amended to meet our business needs, such as available dates differing per tour etc. We would like to keep the existing functionality of the calender but just have the updates that allow the calender to function in the latest versions of chrome and IE now also.