//esta función es para abrir los titulares
       function ver(caso) {
            if (document.getElementById(caso).style.display != "none") {  //en este caso se cierra si hemos pulsado en uno que ya estuviese abierto
                document.getElementById('txt_'+caso).innerHTML = "<h4>mostrar</h4>";
                document.getElementById(caso).style.display = "none"; 
            } else {
                ocultartodos();  //pulsamos en uno cerrado, primero los cerramos todos y mostramos el que pulsamos
                document.getElementById('txt_'+caso).innerHTML = "<h4>ocultar</h4>";
                document.getElementById(caso).style.display = "block";
            }
        }
        //oculta todos los formularios al pulsar en los titulares
        function ocultartodos() {
            document.getElementById('txt_01').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('01').style.display = "none";
			
			document.getElementById('txt_02').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('02').style.display = "none";
			
			document.getElementById('txt_03').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('03').style.display = "none";
			
			document.getElementById('txt_04').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('04').style.display = "none";
			
			document.getElementById('txt_05').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('05').style.display = "none";
			
			document.getElementById('txt_06').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('06').style.display = "none";
			
			document.getElementById('txt_07').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('07').style.display = "none";
			
			document.getElementById('txt_08').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('08').style.display = "none";
			
			document.getElementById('txt_09').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('09').style.display = "none";
			
			document.getElementById('txt_10').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('10').style.display = "none";
			
			document.getElementById('txt_11').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('11').style.display = "none";
			
			document.getElementById('txt_12').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('12').style.display = "none";
			
			document.getElementById('txt_13').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('13').style.display = "none";
			
			document.getElementById('txt_14').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('14').style.display = "none";
			
			document.getElementById('txt_15').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('15').style.display = "none";
			
			document.getElementById('txt_16').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('16').style.display = "none";
			
			document.getElementById('txt_17').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('17').style.display = "none";
			
			document.getElementById('txt_18').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('18').style.display = "none";
			
			document.getElementById('txt_19').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('19').style.display = "none";
			
			document.getElementById('txt_20').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('20').style.display = "none";
			
			document.getElementById('txt_21').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('21').style.display = "none";
			
			document.getElementById('txt_22').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('22').style.display = "none";
			
			document.getElementById('txt_23').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('23').style.display = "none";
			
			document.getElementById('txt_24').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('24').style.display = "none";
			
			document.getElementById('txt_25').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('25').style.display = "none";
			
			document.getElementById('txt_26').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('26').style.display = "none";
			
			document.getElementById('txt_27').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('27').style.display = "none";
			
			document.getElementById('txt_28').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('28').style.display = "none";
			
			document.getElementById('txt_29').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('29').style.display = "none";
			
			document.getElementById('txt_30').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('30').style.display = "none";
			
			document.getElementById('txt_31').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('31').style.display = "none";
			
			document.getElementById('txt_32').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('32').style.display = "none";
			
			document.getElementById('txt_33').innerHTML = "<h4>mostrar</h4>";
            document.getElementById('33').style.display = "none";
			
		}