function show_element(nombre)
{
	objeto = document.getElementById(nombre);
	if(objeto.style['visibility'] == 'hidden')
		{
			objeto.style['visibility'] = "visible";
			objeto.style['display'] = "block";
		}
	else
		{
			objeto.style['visibility'] = "hidden";
			objeto.style['display'] = "none";
		}
}