function validar()
{
	errores="";
	var r = true;
	r = MM_validateForm('usuario','','R','contrasena','','R');
	return r;
}
function validar2()
{
	var f = document.form1;
	errores="";
	var r = true;
	r = MM_validateForm('email','','R');
	if (r && f.email.value!="") r=esCorreoE(f.email.value);
	return r;
}