function menu_link(num)
{
	switch(num)

	{

	  case 1:window.location="plant_site_features.htm" ;break;

	  case 2:window.location="on-time_delivery.htm" ;break;

	  case 3:window.location="capabilities.htm" ;break;

	  case 4:window.location="centrally_located.htm" ;break;

	}
}