datetime picker

Hi everyone

can someone tell me how to use this date picker.

http://jqueryui.com/demos/datepicker/dr ... -year.html

I have took a look at this source code of page above

view-source:http://jqueryui.com/demos/datepicker/dropdown-month-year.html

and try to copy everything into my page and it does not work, can someone give me some tip or guide.

thanks a lot to everyone.