var PageName = 'Home';

function ClearNav()
{  document.images.Turtle1.src = 'images/Clear.gif';
   document.images.Turtle2.src = 'images/Clear.gif';
   document.images.Turtle3.src = 'images/Clear.gif';
}

function NavOn(which)
{  if (which == 'Turtle1')
      document.images.Turtle1.src = 'images/TurtleIcon.gif';
   if (which == 'Turtle2')
      document.images.Turtle2.src = 'images/TurtleIcon.gif';
   if (which == 'Turtle3')
      document.images.Turtle3.src = 'images/TurtleIcon.gif';
}

function NavOff(which)
{  if (PageFromImage(which) != PageName)
   {  if (which == 'Turtle1')
         document.images.Turtle1.src = 'images/Clear.gif';
      if (which == 'Turtle2')
        document.images.Turtle2.src = 'images/Clear.gif';
      if (which == 'Turtle3')
        document.images.Turtle3.src = 'images/Clear.gif';
   }
}

function SetPage(which)
{  PageName = which;
   ClearNav();
   NavOn(ImageFromPage(which));
}

function PageFromImage(which)
{  var RetPage;
   if (which == 'Turtle1') (RetPage = 'Home');
   if (which == 'Turtle2') (RetPage = 'AboutUs');
   if (which == 'Turtle3') (RetPage = 'Etc');
   
   return RetPage;
}

function ImageFromPage(which)
{  var RetImage;
   if (which == 'Home') (RetImage = 'Turtle1');
   if (which == 'AboutUs') (RetImage = 'Turtle2');
   if (which == 'Etc') (RetImage = 'Turtle3');
   
   return RetImage;
}