<!--
function updateConsumables(item_number){
	var sum = 0;
	var item_ref;
	var item_name;
	var extended_price_element;
	var quantity_element;
	var price_element;
	
	item_ref = "document.consumables.item_" + item_number;
	extended_price_element = eval(item_ref + "_ep");
	quantity_element = eval(item_ref + "_qty");
	price_element = eval(item_ref + "_price");
	extended_price_element.value = (Math.round(Number(quantity_element.value) * price_element.value * 100) / 100).toFixed(2);
	if(isNaN(extended_price_element.value)){
		extended_price_element.value = 0;
		quantity_element.value = 0;
	}
	
	for(var i = 1; i <= 100; i++){
		item_ref = "document.consumables.item_" + i;
		extended_price_element = eval(item_ref + "_ep");
		if(extended_price_element) sum = sum + Number(extended_price_element.value);
	}
	document.consumables.subtotal.value = sum.toFixed(2);
}
-->