function comprobar()
{
	if (document.contacto.nombre.value=='')
	{
		alert("Fallo de insercion. Rellene el campo 'Nombre'.");
		return false;
	}
	else
	{
		if (document.contacto.telefono.value=='')
		{
			alert("Fallo de insercion. Rellene el campo 'Telefono'.");
			return false;
		}
		else
		{	
			if (document.contacto.email.value=='')
			{
				alert("Fallo de insercion. Rellene el campo 'Mail'.");
				return false;
			}
			else
			{
				if (document.contacto.comentario.value=='')
				{
					alert("Fallo de insercion. Rellene el campo 'Comentario'.");
					return false;
				}
				else
				{		
					return true;
				}
				return true;					
			}
			return true;
		}
		return true;
	}
}

function f1()
{
	if (document.formMatr.txt_matr[1].checked)
	{
		document.formMatr.asig1.disabled = 0;
		document.formMatr.asig2.disabled = 0;
		document.formMatr.asig3.disabled = 0;
		document.formMatr.asig4.disabled = 0;
		document.formMatr.asig5.disabled = 0;
		document.formMatr.asig6.disabled = 0;
		document.formMatr.asig7.disabled = 0;
		document.formMatr.asig8.disabled = 0;
		document.formMatr.asig9.disabled = 0;
		document.formMatr.asig10.disabled = 0;
		document.formMatr.asig11.disabled = 0;
	}
	else
	{
		document.formMatr.asig1.disabled = 1;
		document.formMatr.asig2.disabled = 1;
		document.formMatr.asig3.disabled = 1;
		document.formMatr.asig4.disabled = 1;
		document.formMatr.asig5.disabled = 1;
		document.formMatr.asig6.disabled = 1;
		document.formMatr.asig7.disabled = 1;
		document.formMatr.asig8.disabled = 1;
		document.formMatr.asig9.disabled = 1;
		document.formMatr.asig10.disabled = 1;
		document.formMatr.asig11.disabled = 1;
	}
}