title: Enable disable buttons html5/css/javascript
body: <p>i have made a calculator. i have uploaded it on the following webpage.</p>
  
  <p>www.vipulshree.com</p>
  
  <p>i want to highlight a button on clicking it and remove highlight from it when another button is clicked. when the next button is clicked, it should change color/disable/highlight and the previous button comes back to normal. Please help me ive searched all over the net for this and could not find anything. Help me im desperate.</p>
  
  <p>Thank You.</p>