function displayEquipment()
{
	var equipmentID = obj.equipment_id.options[obj.equipment_id.selectedIndex].value;
	if(equipmentID != 0)
		self.location = 'videos.php?eid=' + equipmentID;
	else
		self.location = 'videos.php';
}

function displayIndustry()
{
	var categoryID = obj.category_id.options[obj.category_id.selectedIndex].value;
	if(categoryID != 0)
		self.location = 'videos.php?cid=' + categoryID;
	else
		self.location = 'videos.php';
}