//Valida fecha dd/MM/yyyy
function validaFecha( strValue ) {
  var objRegExp = /^\d{2}\/\d{2}\/\d{4}$/
  if(!objRegExp.test(strValue))
    return false;
  else {
    var arrayDate = strValue.split('/');
    var arrayLookup = { '01' : 31,'03' : 31, '04' : 30,'05' : 31,'06' : 30,'07' : 31,'08' : 31,'09' : 30,'10' : 31,'11' : 30,'12' : 31}
    var intDay = parseInt(arrayDate[0],10);
    if(arrayLookup[arrayDate[1]] != null) {
      if(intDay <= arrayLookup[arrayDate[1]] && intDay != 0)
        return true;
    }
    var intMonth = parseInt(arrayDate[1],10);
    if (intMonth == 2) { 
       var intYear = parseInt(arrayDate[2],10);
		if( ((intYear % 4 == 0 && intDay <= 29) || (intYear % 4 != 0 && intDay <=28)) && intDay !=0)
          return true;
       }
  }
  return false;
}

function validarEmail() {
                	
    var email = document.getElementById('emailNews').value;
    
  	if ((email != '') && (esEmail(email))) {
  		return true;
  	} else {
  		alert('Por favor, introduzca una dirección de correo electrónico válida');
  		return false;
  	}
    						
}
					
function esEmail(valor) {
	var exr = /^[0-9a-z_\-\.]+@[0-9a-z\-\.]+\.[a-z]{2,4}$/i;
	return exr.test(valor);
}