title: How to maintain a global variable across site..
body: <p>My moto: To call a function say XYZ() after gradually increasing time eg. </p>
  
  <pre><code>first time after 3 secs, 
  second time:6 secs
  third time: 12secs
  </code></pre>
  
  <p>This should occur across the pages.. Page A ,B ,C 
  Page A first popup then he surfs to page B then the time should increase/doubled up</p>
  
  <p>I know about <code>setInterval</code> function.. But i am confused how to work with it .. </p>
  
  <p>1)make a new js and call in master file </p>
  
  <p>2)write a script in all pages.</p>