{
boton1 = new Image();
boton1on = new Image();
boton2 = new Image();
boton2on = new Image();
boton3 = new Image();
boton3on = new Image();
boton4 = new Image();
boton4on = new Image();
boton5 = new Image();
boton5on = new Image();

boton1.src = "imagenes/b_ne_off.gif";
boton1on.src = "imagenes/b_ne_on.gif";
boton2.src = "imagenes/b_pr_off.gif";
boton2on.src = "imagenes/b_pr_on.gif";
boton3.src = "imagenes/b_co_off.gif";
boton3on.src = "imagenes/b_co_on.gif";
boton4.src = "imagenes/b_cl_off.gif";
boton4on.src = "imagenes/b_cl_on.gif";
boton5.src = "imagenes/b_cn_off.gif";
boton5on.src = "imagenes/b_cn_on.gif";
}
function cambia(num,act){
	var cambiar;
	cambiar = 'bot' + num;
	document.images[cambiar].src = eval ("boton" + num + act + ".src");
}