title: How to auto scroll down an iframe 100px every 5 secs?
body: <p>I would like to know how can I scroll down an iframe 100px every 5 secs using maybe javascript. I know that there is a <code>window.scrollTo(x,y);</code> but how does this change to an iframe?</p>
  
  <p>The iframe is an external page. <br>
  Any possibility of software to download that does this thing? </p>