title: How to change button color while pressed?
body: <p>I have some buttons on form.For example button1,button2,button3.I want to change button1 color while it's pressed,but as soon as i click button2,button1 color become default and button2 color changed.Like this
  <a href="http://i.stack.imgur.com/yiqN2.png" rel="nofollow">enter image description here</a></p>