var preloaded = [];

preloaded[1]=[loadImage("http://www.conteoggionipartners.it/source/pgs/ABOUT.jpg"), loadImage("http://www.conteoggionipartners.it/source/pgs/ABOUT_OVER.jpg")];
preloaded[2]=[loadImage("http://www.conteoggionipartners.it/source/pgs/WORK.jpg"), loadImage("http://www.conteoggionipartners.it/source/pgs/WORK_OVER.jpg")];

function init() {

if (mtDropDown.isSupported()) {
mtDropDown.initialize();


menu1.onactivate = function() { swapImage("button1", preloaded[1][1].src) };
menu1.ondeactivate = function() { swapImage("button1", preloaded[1][0].src) };

menu2.onactivate = function() { swapImage("button2", preloaded[2][1].src) };
menu2.ondeactivate = function() { swapImage("button2", preloaded[2][0].src) };

}
}

// preloader
function loadImage(sFilename) {
	var img = new Image();
	//img.src ="/nom du répertoire/" + sFilename;
	img.src =sFilename;
	return img;
}

// swapper l'image
function swapImage(imgName, sFilename) {
	document.images[imgName].src = sFilename;
}

function lz(numero, cifre) {
	n = String(numero);
	while (n.length<cifre) { 
		n="0"+n 
	}
	return n;
}