if(document.images) {
		
		etapa1off = new Image();
		etapa1off.src = "../../img/menu/etapa1.gif";
		etapa1over = new Image();
		etapa1over.src = "../../img/menu/etapa1_ovr.gif";

		etapa2off = new Image();
		etapa2off.src = "../../img/menu/etapa2.gif";
		etapa2over = new Image();
		etapa2over.src = "../../img/menu/etapa2_ovr.gif";
		
		etapa3off = new Image();
		etapa3off.src = "../../img/menu/etapa3.gif";
		etapa3over = new Image();
        etapa3over.src = "../../img/menu/etapa3_ovr.gif";

		etapa4off = new Image();
		etapa4off.src = "../../img/menu/etapa4.gif";
		etapa4over = new Image();
		etapa4over.src = "../../img/menu/etapa4_ovr.gif";
		
		etapa5off = new Image();
		etapa5off.src = "../../img/menu/etapa5.gif";
		etapa5over = new Image();
		etapa5over.src = "../../img/menu/etapa5_ovr.gif";

		etapa6off = new Image();
		etapa6off.src = "../../img/menu/etapa6.gif";
		etapa6over = new Image();
		etapa6over.src = "../../img/menu/etapa6_ovr.gif";
		
}

function onoff(imgName,state) {
        if(document.images) {               
			document.images[imgName].src = eval(imgName+state+".src");
        }
}