function updateNav(n) {
  if(window.parent.document.getElementById("navigation")) {
    var txt="";
    switch(n) {
      case 0: break;
      case 1: txt="<a href='javascript:link(1)'>What's New?</a>"; break;
      case 2: txt="<a href='javascript:link(2)'>Excerpts</a>"; break;
      case 3: txt="<a href='javascript:link(3)'>Reviews</a>"; break;
      case 4: txt="<a href='javascript:link(4)'>About the Author</a>"; break;
      case 5: txt="<a href='javascript:link(5)'>Photo Gallery</a>"; break;
      case 6: txt="<a href='javascript:link(6)'>Multimedia</a>"; break;
      case 7: txt="<a href='javascript:link(7)'>Film & T.V.</a>"; break;
      case 8: txt="<a href='javascript:link(8)'>Art, Comics & Cartoons</a>"; break;
      case 9: txt="<a href='javascript:link(9)'>Contests</a>"; break;
      case 10: txt="<a href='javascript:link(10)'>Message Board</a>"; break;
      case 12: txt="<a href='javascript:link(12)'>Links</a>"; break;
      default: 
    }
    if(txt!="") window.parent.document.getElementById("navigation").innerHTML=txt;
  }
}