function init() {
  
  var tabs = document.getElementById("tabs");
  
  for(i = 0; i < tabs.getElementsByTagName("TD").length; i++) {
    
    tabs.getElementsByTagName("TD")[i].onmouseover = function() {
      this.style.background = "#009900";    // Achtergrondkleur bij mouseover.
    }
    
    tabs.getElementsByTagName("TD")[i].onmouseout = function() {
      this.style.background = "#003366";    // Standaard achtergrondkleur.
    }
    
    tabs.getElementsByTagName("TD")[i].onclick = function() {
      href = this.getElementsByTagName("A")[0].href;
      window.location = href;
    }
    
  }
   NT_init();
  
}

window.onload = init;