function Randomize() {
	try {
		var varRandom = parseInt((Math.random() * 4) + 1);
		document.getElementById("divHeader").style.backgroundImage = "url(library/images/header_background_" + varRandom + ".jpg)";
		document.getElementById("divNavigation").style.backgroundImage = "url(library/images/navigation_background_" + varRandom + ".jpg)";
	}
	catch (e) {
		//alert ("function fnLoadBanner : " + e.message);
	}
}