function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_showHideLayers() { //v6.0
  var i, p, v, obj, args = MM_showHideLayers.arguments;
  for(i=0; i<(args.length-2); i+=3) {
    if((obj = MM_findObj(args[i])) != null) { 
      v = args[i+2];
      if(obj.style) { 
        obj=obj.style;
        v=(v=='show')?'visible':(v=='hide')?'hidden':v; 
      }
      obj.visibility=v; 
    }
  }
}

function swapImg(obj, src) {
  obj.src = '../img/nav/' + src;
}