I have a fiddle which displays date picker. same code i have written below but nothing happens, what wrong i am doing? When i click on that green colour then no date picker is g
Your CSS isn't being detected because you have your link in the body. If I remove the CSS from your fiddle, it doesn't display at all:
http://jsfiddle.net/cBwEK/11/
Try moving this to the head tag along with your script elements. I've also changed your comment block to the correct HTML syntax:
.......
Also, your class for the input is date picker. Looking at your mootools script, this should be datepicker.