var button11 = new Image();
button11.src = "images/nav/home-out.gif";
var button21 = new Image();
button21.src = "images/nav/unternehmen-out.gif";
var button31 = new Image();
button31.src = "images/nav/produkte-out.gif";
var button41 = new Image();
button41.src = "images/nav/qualitaetsmanagement-out.gif";
var button51 = new Image();
button51.src = "images/nav/downloads-out.gif";
var button61 = new Image();
button61.src = "images/nav/kontakt-out.gif";

var button12 = new Image();
button12.src = "images/nav/home-act.gif";
var button22 = new Image();
button22.src = "images/nav/unternehmen-act.gif";
var button32 = new Image();
button32.src = "images/nav/produkte-act.gif";
var button42 = new Image();
button42.src = "images/nav/qualitaetsmanagement-act.gif";
var button52 = new Image();
button52.src = "images/nav/downloads-act.gif";
var button62 = new Image();
button62.src = "images/nav/kontakt-act.gif";

var navstat = 0;

function changeimg(x,name)
{ 
  if (x == navstat)
  {
    return;
  }
  else
  {
    window.document.images[x].src = name.src;
  }
}

function showpage(x,URL1,URL2,name)
{
  navstat = x;
  parent.frames[3].location.href = URL1;
  parent.frames[4].location.href = URL2;
  
  initnav();
  window.document.images[x].src = name.src;
}

function initnav()
{
  window.document.images[0].src = button11.src;
  window.document.images[1].src = button21.src;
  window.document.images[2].src = button31.src;
  window.document.images[3].src = button41.src;
  window.document.images[4].src = button51.src;
  window.document.images[5].src = button61.src;
   
}