window.onload = function() 


{
	var nav = document.getElementById("extracontent");
	if (nav) {
		var imgs = nav.getElementsByTagName("img");
		var getImage = function(s) {
			var  i = new Image();
			i.src = s;
			return i;
		}

		for (var i = 0, img = null; img = imgs[i]; i++) {
			img.onmouseover = mouseoverNav;
			img.onmouseout = mouseoutNav;
		}
	}
}

function mouseoverNav() {
	if (this.filters && this.filters.length == 1) {
		this.filters[0].enabled = true;
	} else {
		this.style.MozOpacity = .5;
		this.style.opacity = .5;
	}
}

function mouseoutNav() {
	if (this.filters && this.filters.length == 1) {
		this.filters[0].enabled = false;
	} else {
		this.style.MozOpacity = 1;
		this.style.opacity = 1;
	}
}





;