addLoadListener(init);

function init()
{
  document.forms[0].onsubmit = validateFields;
  return true;
}

function validateFields() {
  var elements = document.forms[0].elements;
  var emailPattern = /^[\w\.\-]+@([\w\-]+\.)+[a-zA-Z]+$/;
  var menserror = 'El formulario no puede ser enviado.\n';
  var botxt =  document.getElementById('env_bot').value;
document.getElementById('env_bot').value = "Espere, por favor...";
document.getElementById('env_bot').disabled = true;
  

  
    for (var i = 0; i < elements.length; i++)  {
		elements[i].style.backgroundColor = "#ffffff";
	if (/(^| )validar( |$)/.test(elements[i].className) && elements[i].value == "") {
		elements[i].focus();
		elements[i].style.backgroundColor = "#ff9d9d";
		//elements[i].style.borderColor = "#ff0000";
		quien = elements[i].name;
		mimenserror = menserror + 'Por favor, rellene la casilla ' + quien+'.';
		alert(mimenserror);
		document.getElementById('env_bot').value = botxt;
		document.getElementById('env_bot').disabled = false;
		return false;
    }

    if (/(^| )valEmail( |$)/.test(elements[i].className) && !emailPattern.test(elements[i].value))     {
		elements[i].focus();
		elements[i].style.backgroundColor = "#ff9d9d";
		quien = elements[i].name;
		mailmal = menserror;
		mailmal = mailmal + '\nEl email no parece válido.';
		alert(mailmal);
		document.getElementById('env_bot').value = botxt;
		document.getElementById('env_bot').disabled = false;
		return false;
    }
	
	
	}

				
			
	
return true;

}

function addLoadListener(fn)
{
  if (typeof window.addEventListener != 'undefined')
  {
    window.addEventListener('load', fn, false);
  }
  else if (typeof document.addEventListener != 'undefined')
  {
    document.addEventListener('load', fn, false);
  }
  else if (typeof window.attachEvent != 'undefined')
  {
    window.attachEvent('onload', fn);
  }
  else
  {
    var oldfn = window.onload;
    if (typeof window.onload != 'function')
    {
      window.onload = fn;
    }
    else
    {
      window.onload = function()
      {
        oldfn();
        fn();
      };
    }
  }
}