var current_d=new Image();
current_d.src="/img/nav/current-d.gif";
var current_h=new Image();
current_h.src="/img/nav/current-h.gif";
var current_a=new Image();
current_a.src="/img/nav/current-a.gif";

var past_d=new Image();
past_d.src="/img/nav/past-d.gif";
var past_h=new Image();
past_h.src="/img/nav/past-h.gif";
var past_a=new Image();
past_a.src="/img/nav/past-a.gif";

var forthcoming_d=new Image();
forthcoming_d.src="/img/nav/forthcoming-d.gif";
var forthcoming_h=new Image();
forthcoming_h.src="/img/nav/forthcoming-h.gif";
var forthcoming_a=new Image();
forthcoming_a.src="/img/nav/forthcoming-a.gif";