Event.observe(window, "load", function () {
	var imgArray = new Array;
	imgArray[0] = "./images/bg-navContent1.jpg";
	imgArray[1] = "./images/bg-navContent2.jpg";
	imgArray[2] = "./images/bg-navContent3.jpg";
	imgArray[3] = "./images/bg-navContent4.jpg";
	imgArray[4] = "./images/bg-navContent5.jpg";
	var random = Math.floor(Math.random() * imgArray.length);
	var imgURL = "url(" + imgArray[random] + ")";
	
	var navContent = $("navContent");
	if (!navContent) {
		navContent = $("navContentEn");
	}
	navContent.setStyle({backgroundImage: imgURL});
});