function cambiaContenido(idLayer,titulo,total){
	
	for(i=1;i<=total;i++)
	{
		document.getElementById('layer'+i).style.display = 'none';
		document.getElementById('titulo_layer').innerHTML = titulo;
		document.getElementById("menu_interno"+i).className = 'interno';
		//obj.className = 'interno_activo';
		//document.getElementById('lista'+i).className = 'normal';
	}
	document.getElementById("menu_interno"+idLayer).className = 'interno_activo';
	document.getElementById('layer'+idLayer).style.display = 'block';
}

function validaCheck(form)
{
	//alert(form['FORMA[BOL_CAP_EXALUMNO]']);
    if(form['FORMA[BOL_CAP_EXALUMNO]'].checked) 
	{
		form['FORMA[BOL_CAP_CLAVE]'].disabled = false;
	}
	else
	{
		form['FORMA[BOL_CAP_CLAVE]'].disabled = true;
	}
}