function mostrar(capa){
var obj = document.getElementById(capa);
	if(obj.style.display == "block"){
		//cierra
		obj.style.display = "none";
	}else{
		//abre
		obj.style.display = "block"
	}	
}
function validar_fono(fono){
	var result=false;
	var filter = /^([\(\)0-9])+\-([0-9]{4})+$/;
	if(filter.test(fono)) result=true;
	return result;
}
function validar_email(email){
	var result=false;
	var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(email)) result= true;
	return result;
}