function change_navigation(ziel)
{
  if (parent.frames[0])
  {
  switch (ziel)
  {
        case 'start':
        {
        parent.frames[0].location.href="navistart.htm";
        break;
        }
        case 'home':
        {
        parent.frames[0].location.href="navihome.htm";
        break;
        }
        case 'links':
        {
        parent.frames[0].location.href="navilinks.htm";
        break;
        }
        case 'bilder':
        {
        parent.frames[0].location.href="navibilder.htm";
        break;
        }
        case 'estart':
        {
        parent.frames[0].location.href="enavistart.htm";
        break;
        }
        case 'ehome':
        {
        parent.frames[0].location.href="enavihome.htm";
        break;
        }
        case 'elinks':
        {
        parent.frames[0].location.href="enavilinks.htm";
        break;
        }
        case 'ebilder':
        {
        parent.frames[0].location.href="enavibilder.htm";
        break;
        }
  }
  }
}