function mostrarOcultar(id_contenedor, id_imagen, path_imagen_on, path_imagen_off){
	var contenedor = document.getElementById(id_contenedor).style;
	var imagen = document.getElementById(id_imagen);
	if(contenedor.display == ""){
		contenedor.display = "none";
		imagen.src = path_imagen_on;
	}
	else{
		contenedor.display = "";
		imagen.src = path_imagen_off;
	}
}
function comprobar_cuit(nro){
	var suma;
	var resto;
	var verif;
	var pos = nro.split('');

	if (! /^\d{11}$/.test(nro)) return false;

	while(true){
		suma = (pos[0] * 5 + pos[1] * 4 + pos[2] * 3 +
		pos[3] * 2 + pos[4] * 7 + pos[5] * 6 +
		pos[6] * 5 + pos[7] * 4 + pos[8] * 3 + pos[9] * 2);
		resto = suma % 11;

		if(resto == 0){
			verif = 0;
			break;
		}
		else if(resto == 1 && (pos[1] == 0 || pos[6] == 7)){
			pos[1] = 4;
			continue;
		}
		else{
			verif = 11 - resto;
			break;
		}
	}

	return pos[10] == verif;
}