title: javascript for changing button states
body: <p>This is what I am looking for:</p>
  
  <p><a href="https://stackoverflow.com/questions/13423782/how-to-keep-button-active-after-press-with-jquery/27270988#27270988">How to keep button active after press with jQuery</a></p>
  
  <p>I want four buttons and at only one time one button is active. </p>
  
  <p>For example if button one is pressed the others are not shown active and vice versa for the other buttons. </p>