function switchHeadImage(enabled) {
	if (enabled) {
		var rand = Math.ceil(Math.random()*13);
		document.getElementById("header").style.backgroundImage = 'url(http://www.esteco.com/images/headers/header' + rand + '.jpg)';
	} else {
		document.getElementById("header").style.backgroundImage = 'url(http://www.esteco.com/images/headers/header6.jpg)';
	}
}

function loadIE6pngs() {
	var arVersion = navigator.appVersion.split("MSIE")
	var version = parseFloat(arVersion[1])
	if ((version >= 5.5) && (document.body.filters)) {
		var estecoMenu = document.getElementById("header_menu").getElementsByTagName("ul")[0];
		var items = estecoMenu.getElementsByTagName("a");
		for (i=0; i<items.length; i++) {
			var link = items[i];
			link.className = 'ie6png_workaround';
			link.style.backgroundImage = 'none';
		}
		document.getElementById("transparent_logo").className = "ie6png_logo_workaround";
		document.getElementById("transparent_logo").src = "http://www.esteco.com/images/esteco_transp.gif";
	 }
}

function switchUm08Image() {
	var rand = Math.ceil(Math.random()*2);
	if (rand>1) {
		document.getElementById("bannerLink").href    = 'http://um08.esteco.it';
		document.getElementById("bannerImgUm08").style.display  = 'block';
		document.getElementById("bannerImgMf4") .style.display  = 'none';
	} else {
		document.getElementById("bannerLink").href = 'products.jsp';
		document.getElementById("bannerImgUm08").style.display  = 'none';
		document.getElementById("bannerImgMf4") .style.display  = 'block';
	}
}