Top 10 Jquery Examples with Live Demos

What is jquery?
A example is more worth than 100 words

how many lines of code you might need to achieve this?

Answer: Only four lines and that too without knowing any regular expressions….. Yes. Using a library called jquery and its validate plugin. Code is shown below.

$.validator.setDefaults({
submitHandler: function() { alert("submitted!"); }
});
$().ready(function() {
// validate the comment form when it is submitted
$("#commentForm").validate();
});

Below are some good design examples of what you can achieve using jquery.
If you have came across any nice implementation of Jquery, let me know through comments. I will like to update my list.