jQuery: Access value of selected/checked radio button

if you have a group of radio buttons (grouping done using same value for name attribute in all) and you want to get value of selected radio button out of them,
using jquery you can do that with below code snippet:

Suppose you have:

Diya [name="bolly",value="diya"]
Kareena [name="bolly",value="kareena"]
Katrina [name="bolly",value="katrina"]

Then,

var sel_val = $('input:radio[name=bolly]:checked').val();

You will get: sel_val = "diya"

For more reference:
http://stackoverflow.com/questions/986120/how-to-get-select-radiobutton-value-using-its-name-in-jquery