for (var i=1;i<=7;i++) {
  var node=document.getElementById('navLink'+i.toString());
  if (node.getAttribute('href')==self.location.href) {
    node.style.background = 'url(http://g4p.de/windwalk/images/nav/' + i + 'mo.jpg) no-repeat scroll left top';
  }
}
if(navigator.userAgent.indexOf("Firefox/3.")!=-1){document.body.style.margin="0 0 0 0";}