function registrarse(){
	var username = document.getElementById('username');
	var passwd = document.getElementById('passwd');
	var email = document.getElementById('email');
	if(username.value == ""){
		email.style.borderColor="#CCCCCC";
		passwd.style.borderColor="#CCCCCC";
		username.style.borderColor="red";
		username.focus();
		alert("Debes introducir un Nombre de usuario!");
		return(0);
	}
	else if(passwd.value == ""){
		email.style.borderColor="#CCCCCC";
		username.style.borderColor="#CCCCCC";
		passwd.style.borderColor="red";
		passwd.focus();
		alert("Debes introducir una clave!");
		return(0);
	}
	else if(email.value == ""){
		username.style.borderColor="#CCCCCC";
		passwd.style.borderColor="#CCCCCC";
		email.style.borderColor="red";
		email.focus();
		alert("Debes introducir un e-mail!");
		return(0);
	}
	document.registro.submit();
}
function cambiadatos(){
	var email = document.getElementById('email');
	if(email.value == ""){
		email.style.borderColor="red";
		email.focus();
		alert("Debes introducir un e-mail!");
		return(0);
	}
	document.registro.submit();
}