// Check whether the page is opened from within the main frame.
// If not, display a "Home" link to allow the user to get back to the main page.
//
// Include this script in-line where you want the link to appear.

   var sParent=""+parent.location;      // Get location and convert to a string

   if ((sParent.search("index.html")<0) && (sParent.lastIndexOf("/") != sParent.length-1))  // This child document is not opened within the main containing frame.
      {
         document.write('<p align="center"><a href="index.html" target="_top">Home</a></p>');
      }