var d = document;

if (d.images) {

	navt1On = new Image();
	navt1Off = new Image();
	navb1On = new Image();
	navb1Off = new Image();
	navt1On.src = "http://www.edge.co.uk/img/nav/home_top_on.gif";
	navt1Off.src = "http://www.edge.co.uk/img/nav/home_top_off.gif";
	navb1On.src = "http://www.edge.co.uk/img/nav/home_bottom_on.gif";
	navb1Off.src = "http://www.edge.co.uk/img/nav/home_bottom_off.gif";
	
	navt2On = new Image();
	navt2Off = new Image();
	navb2On = new Image();
	navb2Off = new Image();
	navt2On.src = "http://www.edge.co.uk/img/nav/believes_top_on.gif";
	navt2Off.src = "http://www.edge.co.uk/img/nav/believes_top_off.gif";
	navb2On.src = "http://www.edge.co.uk/img/nav/believes_bottom_on.gif";
	navb2Off.src = "http://www.edge.co.uk/img/nav/believes_bottom_off.gif";
	
	navt3On = new Image();
	navt3Off = new Image();
	navb3On = new Image();
	navb3Off = new Image();
	navt3On.src = "http://www.edge.co.uk/img/nav/delivers_top_on.gif";
	navt3Off.src = "http://www.edge.co.uk/img/nav/delivers_top_off.gif";
	navb3On.src = "http://www.edge.co.uk/img/nav/delivers_bottom_on.gif";
	navb3Off.src = "http://www.edge.co.uk/img/nav/delivers_bottom_off.gif";
	
	navt4On = new Image();
	navt4Off = new Image();
	navb4On = new Image();
	navb4Off = new Image();
	navt4On.src = "http://www.edge.co.uk/img/nav/listens_top_on.gif";
	navt4Off.src = "http://www.edge.co.uk/img/nav/listens_top_off.gif";
	navb4On.src = "http://www.edge.co.uk/img/nav/listens_bottom_on.gif";
	navb4Off.src = "http://www.edge.co.uk/img/nav/listens_bottom_off.gif";
	
	navt5On = new Image();
	navt5Off = new Image();
	navb5On = new Image();
	navb5Off = new Image();
	navt5On.src = "http://www.edge.co.uk/img/nav/loves_top_on.gif";
	navt5Off.src = "http://www.edge.co.uk/img/nav/loves_top_off.gif";
	navb5On.src = "http://www.edge.co.uk/img/nav/loves_bottom_on.gif";
	navb5Off.src = "http://www.edge.co.uk/img/nav/loves_bottom_off.gif";
	
	navt6On = new Image();
	navt6Off = new Image();
	navb6On = new Image();
	navb6Off = new Image();
	navt6On.src = "http://www.edge.co.uk/img/nav/invites_top_on.gif";
	navt6Off.src = "http://www.edge.co.uk/img/nav/invites_top_off.gif";
	navb6On.src = "http://www.edge.co.uk/img/nav/invites_bottom_on.gif";
	navb6Off.src = "http://www.edge.co.uk/img/nav/invites_bottom_off.gif";

}

function onOff(id) {
	for (i=1; i<=6; i++) {
		t_image = "navt"+i;
		b_image = "navb"+i;
		if (i == id) {
			d[t_image].src = eval(t_image+ "On.src");
			d[b_image].src = eval(b_image+ "On.src");
		} else {
			d[t_image].src = eval(t_image+ "Off.src");
			d[b_image].src = eval(b_image+ "Off.src");
		}
	}
	//swapLayers(id);
}

function imgOn(id) {
	t_image = "navt"+id;
	b_image = "navb"+id;
	d[t_image].src = eval(t_image+ "On.src");
	d[b_image].src = eval(b_image+ "On.src");
}

function imgOff(id) {
	t_image = "navt"+id;
	b_image = "navb"+id;
	d[t_image].src = eval(t_image+ "Off.src");
	d[b_image].src = eval(b_image+ "Off.src");
}

function swapLayers(layer_id) {
	for (i=1; i<=6; i++) {
		l = d.getElementById('layer'+i);
		s = d.getElementById('sub'+i);
		if (i == layer_id) {
			//content layer
			l.style.visibility = "visible";
			l.style.display = 'inline';
			//sub-nav layer
			s.style.visibility = "visible";
			s.style.display = 'inline';
		} else {
			//content layers
			l.style.visibility = "hidden";
	        l.style.display = 'none';
			//sub-nav layers
			s.style.visibility = "hidden";
	        s.style.display = 'none';
		}
  	}
}

function popUp(URL, width, height) {
	day = new Date();
	id = day.getTime();
	window.open(URL, id, "toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=1,width="+width+",height="+height+"');");
}