function validRequired(formField,fieldLabel)
{
	var result = true;
	
	if (formField.value == "")
	{
		alert('El campo "'+fieldLabel +'" es requerido');
		formField.focus();
		result = false;
	}
	
	return result;
}

function allDigits(str)
{
	return inValidCharSet(str,"0123456789");
}

function inValidCharSet(str,charset)
{
	var result = true;

	// Note: doesn't use regular expressions to avoid early Mac browser bugs	
	for (var i=0;i<str.length;i++)
		if (charset.indexOf(str.substr(i,1))<0)
		{
			result = false;
		break;
		}
	
	return result;
}

function validNum(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		if (!allDigits(formField.value))
 		{
 			alert('El campo "' + fieldLabel +'" debe contener un valor numerico');
			formField.focus();		
			result = false;
		}
	} 
	
	return result;
}

function isEmailAddr(email)
{
  var result = false;
  var theStr = new String(email);
  var index = theStr.indexOf("@");
  if (index > 0)
  {
    var pindex = theStr.indexOf(".",index);
    if ((pindex > index+1) && (theStr.length > pindex+1))
	result = true;
  }
  return result;
}

function validEmail(formField,fieldLabel,required)
{
	var result = true;
	
	if (required && !validRequired(formField,fieldLabel))
		result = false;

	if (result && ((formField.value.length < 2) || !isEmailAddr(formField.value)) )
	{
		alert("Formato de e-Mail invalido, verifique por favor");
		formField.focus();
		result = false;
	}
   
  return result;

}

function validEquals(formField,formField2,fieldLabel1,fieldLabel2)
{
	var result = true;
	
	if (formField.value != formField2.value)
	{
		formField.value = "";
		formField2.value = "";
		alert('El campo "'+fieldLabel1 +'" debe ser igual al campo "'+ fieldLabel2+'"');
		formField.focus();
		result = false;
	}
	
	return result;
} 

//---------------------------------------------------------------------------------------------------------
function validar_contacto(theForm)
{
	if (!validRequired(theForm.nombre, "Nombre"))
 		return false;
	
	if (!validEmail(theForm.mail, "Email", true))
 		return false;
		
	if(theForm.pais.value == ""){
		 alert("Debe seleccionar un Pais");
		 return false;
	}
	
	if(theForm.ciudad.value == ""){
		 alert("Debe seleccionar una Ciudad");
		 return false;
	}
	
	return true;
}