title: scrollBy doesn't work in Firefox and Opera
body: <p>This scrollBy function works in Internet Explorer, but ignores by Firefox and Opera. Can anyone help to solve this problem?</p>
  
  <pre><code>function scrollLeft(s){
  document.frames['my_iframe'].scrollBy(-s,0);
  window.frames['my_iframe'].scrollBy(-s,0);
  }
  
  function scrollRight(s){
  document.frames['my_iframe'].scrollBy(s,0);
  window.frames['my_iframe'].scrollBy(s,0);
  }
  </code></pre>
  
  <p>Here is an example that works in Internet Explorer browser, but doesn't work in Firefox and Opera: <a href="http://igproject.ru/iframe-scrolling/index.htm" rel="nofollow">http://igproject.ru/iframe-scrolling/index.htm</a></p>