function ddlCategory_OnChange(src)
{
	if(src.selectedValue != null)
	{
		document.getElementById(src.selectedValue).style.display = "none";
	}
	
	var element = document.getElementById(src.value);
	
	if(element != null)
	{
		element.style.display = "block";

		src.selectedValue = src.value;
	}
}