function feedbackCategoryChanged(selectedValue)
{
	var productCode = document.getElementById('tr_ctrl_feedback_product_code_text_box_field');
	var services = document.getElementById('tr_ctrl_feedback_services_drop_down_list_field');

	// test
	if (null != productCode && null != services)
	{
		// hide them
		productCode.style.visibility = 'hidden';
		productCode.style.display = 'none';
		
		services.style.visibility = 'hidden';
		services.style.display = 'none';
	
		// show the required one
		switch (selectedValue)
		{
			case 1:
			{
				productCode.style.visibility = 'visible';
				productCode.style.display = '';
				break;
			}
			case 2:
			{
				services.style.visibility = 'visible';
				services.style.display = '';
				break;
			}
			default:
			{
				break;
			}
		}
	}
	
	// return true: function used in onLoadBody
	return true;
}