function Enviar()
{
	var oValue
	
	oValue = true;
	
	if (theForm.txtNombre.value == '')
	{
		ErrorNombre.className = 'visibilityvisible';
		oValue = false;
	}
	else
		ErrorNombre.className = 'visibilityhidden';
	
	if (theForm.txtApellido.value == '')
	{
		ErrorApellido.className = 'visibilityvisible';
		oValue = false;
	}
	else
		ErrorApellido.className = 'visibilityhidden'; 
		
	if (theForm.txtEmail.value == '')
	{
		ErrorEmail.className = 'visibilityvisible';
		oValue = false;
	}
	else
		ErrorEmail.className = 'visibilityhidden';
		
	if (theForm.txtTelefono.value == '')
	{
		ErrorTelefono.className = 'visibilityvisible'; 
		oValue = false;
	}
	else
		ErrorTelefono.className = 'visibilityhidden';
		
	if (oValue == true)
	{
		theForm.accion.value  =  'enviar';
		theForm.submit();
	}
	return true;
}

function Clear()
{
	theForm.txtNombre.value   = ''; 
	theForm.txtApellido.value = '';
	theForm.txtEmail.value = '';
	theForm.txtTelefono.value = '' ;
	theForm.txtCiudad.value = '' ;
	theForm.txtMensaje.value = '' ;
	theForm.txtLineaAerea.value = '' ;
	theForm.txtNumeroVuelo.value = '' ;
	ErrorNombre.className = 'visibilityhidden';
	ErrorApellido.className = 'visibilityhidden';
	ErrorEmail.className = 'visibilityhidden';
	ErrorTelefono.className = 'visibilityhidden';
	return true;
}

function changePage()
{
	theForm.submit(); 
	return true;
}