Added a nice JSCalendar to the blogger

I added a nice JSCalendar to my blog. The instructions from ecmanaut helped. The first part is relatively easy. But the seconf part is difficult to follow. I ended up have to dig into the source code to find out how it works. After a hour or so, I finally figured out the basic functions. The challenge is because I used a customized template so that many CSS tags used by the scripts are not included. I have to change the template to include al l those CSS tags just to make the calendar work. I still cannot get the title hint to work as it requires more template change which I am not willing to spend more time. So I stopped here. But it is good enough for me now.