function update_total()
{
	var total = 0;
	var item_count = 0;
	
	var revelationbook = $('revelationbook').value
	var nuclearsurvivalbook = $('nuclearsurvivalbook').value
	var potasiumiodide = $('potasiumiodide').value
	var restorationbook = $('restorationbook').value
	var yearleap = $('yearleapbook').value
	var mineraldrops = $('mineraldrops').value
	var preparationDVD = $('preparationDVD').value
	var naturesbook = $('naturesbook').value
	var packagedeal = $('packagedeal').value
	var kitablets = $('kitablets').value
	var saltspray = $('saltspray').value
	
	var total_revelationbook = 0
	var total_nuclearsurvivalbook = 0
	var total_potasiumiodide = 0
	var total_restorationbook = 0
	var total_yearleap = 0
	var total_mineraldrops = 0
	var total_preparationDVD = 0
	var total_naturesbook = 0
	var total_packagedeal = 0
	var total_kitablets = 0
	var total_saltspray = 0
	
	book_price = 10
	discounted_book_price = 6 //if 5 or more
	dvdprice = 6
	dvd_discount = 4 //if 5 or more
	naturesprice = 6
	discounted_naturesprice = 4 //if 5 or more
	kitabletsprice = 8
	saltbottleprice = 10
	discounted_saltbottleprice = 8 //if 5 or more
	package_price = 50
	discounted_package_price = 40 //if 5 or more
	shipping = 10
	
	
	if (revelationbook < 5)
		total_revelationbook += revelationbook * book_price
	else
		total_revelationbook += revelationbook * discounted_book_price

	if (nuclearsurvivalbook < 5)
		total_nuclearsurvivalbook += nuclearsurvivalbook * book_price
	else
		total_nuclearsurvivalbook += nuclearsurvivalbook * discounted_book_price

	if (potasiumiodide < 5)
		total_potasiumiodide += potasiumiodide * book_price
	else
		total_potasiumiodide += potasiumiodide * discounted_book_price

	if (restorationbook < 5)
		total_restorationbook += restorationbook * book_price
	else
		total_restorationbook += restorationbook * discounted_book_price
		
	total_yearleap += yearleap * book_price
		
	if (mineraldrops < 5)
		total_mineraldrops += mineraldrops * book_price
	else
		total_mineraldrops += mineraldrops * discounted_book_price

	if (preparationDVD < 5)
		total_preparationDVD += preparationDVD * dvdprice
	else
		total_preparationDVD += preparationDVD * dvd_discount
		
	if (naturesbook < 5)
		total_naturesbook = naturesbook * naturesprice
	else
		total_naturesbook += naturesbook * discounted_naturesprice

	if (packagedeal < 5)
		total_packagedeal += packagedeal * package_price
	else
		total_packagedeal += packagedeal * discounted_package_price
		
	total_kitablets += kitablets * kitabletsprice

	if (saltspray < 5)
		total_saltspray += saltspray * saltbottleprice
	else
		total_saltspray += saltspray * discounted_saltbottleprice

	//round to nearest cent
	sub_total = total_revelationbook + total_nuclearsurvivalbook + total_potasiumiodide + total_restorationbook + total_yearleap + total_mineraldrops + total_preparationDVD + total_naturesbook + total_packagedeal + total_kitablets + total_saltspray 
	if ( total_potasiumiodide > 0 || total_mineraldrops > 0 || total_packagedeal > 0 || total_kitablets > 0 || total_saltspray > 0 )
		shipping = 10;
	else
		shipping = 0;
	total = sub_total + shipping
	
	display_total("totalnuclearsurvivalbook",total_nuclearsurvivalbook) 
	display_total("totalpotasiumiodide",total_potasiumiodide) 
	display_total("totalrevelationbook",total_revelationbook)
	display_total("totalrestorationbook",total_restorationbook)
	display_total("totalyearleapbook",total_yearleap)
	display_total("totalmineraldrops",total_mineraldrops) 
	display_total("totalpreparationDVD",total_preparationDVD) 
	display_total("totalnaturesbook",total_naturesbook) 
	display_total("totalpackagedeal",total_packagedeal) 
	display_total("totalkitablets",total_kitablets) 
	display_total("totalsaltspray",total_saltspray) 
	display_total("subtotalamount",sub_total)
	display_total("shipping",shipping)
	display_total("totalamount",total)
}

function display_total(div_id, total)
{
	rounded_total = Math.round(total * 100)/100
	Element.replace($(div_id),"<span id='" + div_id + "'>$" + rounded_total + "</span>")
}

function update_pricing()
{
	update_total();
}