  var menu = [
"index.html", 
"kap1.html", 
"kap1-1.html", 
"kap1-1-1.html", 
"kap1-1-2.html", 
"kap1-1-3.html", 
"kap1-2.html", 
"kap1-2-1.html", 
"kap1-2-2.html", 
"kap1-2-3.html", 
"kap1-3.html", 
"kap1-3-1.html", 
"kap1-3-2.html", 
"kap1-3-3.html", 
"kap2.html", 
"kap2-1.html", 
"kap2-1-1.html", 
"kap2-1-2.html", 
"kap2-1-3.html", 
"kap2-1-4.html", 
"kap2-1-5.html", 
"kap2-2.html", 
"kap2-2-1.html", 
"kap2-2-2.html", 
"kap2-2-3.html", 
"kap2-3.html", 
"kap2-3-1.html", 
"kap2-3-2.html", 
"kap2-3-3.html", 
"kap2-3-4.html", 
"kap2-3-5.html", 
"kap2-3-6.html", 
"kap2-3-7.html", 
"exercises.html", 
"exercise1.html", 
"exercise2.html", 
"exercise3.html", 
"exercise4.html", 
"exercise5.html", 
"exercise6.html", 
"exercise7.html", 
"exercise8.html", 
"exercise9.html", 
"exercise10.html", 
"exercise11.html", 
"exercise12.html", 
"exercise13.html", 
"exercise14.html", 
"exercise15.html", 
"exercise16.html", 
"exercise17.html", 
"exercise18.html", 
"exercise19.html", 
"exercise20.html", 
"exercise21.html", 
"exercise22.html", 
"appendix.html", 
"app-lit.html", 
"app-verlad.html", 
"app-matlab.html", 
"schwingungsanalyse_m.html", 
"setcolor_m.html", 
"taste_m.html", 
"app-simulink.html", 
"app-maplesim.html", 
"app-pruef.html", 
"app-papers.html", 
"paper34.html",
"paper35.html",
"paper33.html",
"paper25.html", 
"paper36.html", 
"paper31.html",
"paper32.html", 
"paper27.html", 
"paper18.html", 
"paper24.html", 
"paper20.html",
"app-oldpapers.html"
              ];

  var pageindex;

  function initIndex() {
    myname = window.location.href;
    for (i=0; i < menu.length; i++) {
      if (myname.indexOf(menu[i]) != -1) {
	pageindex = i;
	return;
      }
    }
  }

  function setIndex(i) {
    pageindex = i;
    displayit();
  }

  function increment() {
    if (pageindex < menu.length - 1) {
      pageindex++;
    }
    displayit();
  }

  function decrement() {
    if (pageindex > 0) {
      pageindex--;
    }
    displayit();
  }

  function displayit() {
    window.location.href = menu[pageindex];
  }

