script kürzen

[Der Ultimative]

Moin

So ich hab zwar schon ahnung von javascript aber profi bin ich leider auch noch nicht deswegen habe ich manche scripte natürlich umständlich und sehr groß deswegen wollt ich mal fragen ob mit einer verraten kann wie ich dieses script kürzen kann:

function index()
 {
  document.getElementById("divindex").style.visibility = "visible";
  document.getElementById("divmich").style.visibility = "hidden";
  document.getElementById("divfotos").style.visibility = "hidden";
  document.getElementById("divtest").style.visibility = "hidden";
  document.getElementById("divgaeste").style.visibility = "hidden";
  document.getElementById("divkontakt").style.visibility = "hidden";
  document.getElementById("divdownload").style.visibility = "hidden";
 }

function mich()
 {
  document.getElementById("divindex").style.visibility = "hidden";
  document.getElementById("divmich").style.visibility = "visible";
  document.getElementById("divfotos").style.visibility = "hidden";
  document.getElementById("divtest").style.visibility = "hidden";
  document.getElementById("divgaeste").style.visibility = "hidden";
  document.getElementById("divkontakt").style.visibility = "hidden";
  document.getElementById("divdownload").style.visibility = "hidden";
 }

function fotos()
 {
  document.getElementById("divindex").style.visibility = "hidden";
  document.getElementById("divmich").style.visibility = "hidden";
  document.getElementById("divfotos").style.visibility = "visible";
  document.getElementById("divtest").style.visibility = "hidden";
  document.getElementById("divgaeste").style.visibility = "hidden";
  document.getElementById("divkontakt").style.visibility = "hidden";
  document.getElementById("divdownload").style.visibility = "hidden";
 }

function test()
 {
  document.getElementById("divindex").style.visibility = "hidden";
  document.getElementById("divmich").style.visibility = "hidden";
  document.getElementById("divfotos").style.visibility = "hidden";
  document.getElementById("divtest").style.visibility = "visible";
  document.getElementById("divgaeste").style.visibility = "hidden";
  document.getElementById("divkontakt").style.visibility = "hidden";
  document.getElementById("divdownload").style.visibility = "hidden";
 }

function gaeste()
 {
  document.getElementById("divindex").style.visibility = "hidden";
  document.getElementById("divmich").style.visibility = "hidden";
  document.getElementById("divfotos").style.visibility = "hidden";
  document.getElementById("divtest").style.visibility = "hidden";
  document.getElementById("divgaeste").style.visibility = "visible";
  document.getElementById("divkontakt").style.visibility = "hidden";
  document.getElementById("divdownload").style.visibility = "hidden";
 }

function kontakt()
 {
  document.getElementById("divindex").style.visibility = "hidden";
  document.getElementById("divmich").style.visibility = "hidden";
  document.getElementById("divfotos").style.visibility = "hidden";
  document.getElementById("divtest").style.visibility = "hidden";
  document.getElementById("divgaeste").style.visibility = "hidden";
  document.getElementById("divkontakt").style.visibility = "visible";
  document.getElementById("divdownload").style.visibility = "hidden";
 }

function download()
 {
  document.getElementById("divindex").style.visibility = "hidden";
  document.getElementById("divmich").style.visibility = "hidden";
  document.getElementById("divfotos").style.visibility = "hidden";
  document.getElementById("divtest").style.visibility = "hidden";
  document.getElementById("divgaeste").style.visibility = "hidden";
  document.getElementById("divkontakt").style.visibility = "hidden";
  document.getElementById("divdownload").style.visibility = "visible";
 }

ne beispiel seite die ähnlich ist würde auch gehen wo ich mir was abschaun kann daraus lern ich immer am besten.

MfG