function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function preloadNavbar() {
  var d=document; if(d.images){ if(!d.NB_p) d.NB_p=new Array();
    var i,j=d.NB_p.length,a=preloadNavbar.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){
      d.NB_p[j]=new Image;
      d.NB_p[j++].src= "navbar/" + a[i] + "2.jpg";
      d.NB_p[j]=new Image;
      d.NB_p[j++].src= "navbar/" + a[i] + "3.jpg";}}
}

function showButton(name, ref) {
   document.images[name].src = "navbar/" + name + ref + ".jpg";
}