var itemOptions;
var itemQty;
var currentAmount;
var newAmount;
var totalAmount;
var itemPrice;

function recount_cart(thisItem)
{
 totalAmount = document.getElementById("totalAmount").innerHTML.split(" ");
 itemOptions = thisItem.value.split("=");
 itemQty = document.getElementById(itemOptions[1]).value;
 itemPrice = itemOptions[3].split(" ");
 currentAmount = document.getElementById(itemOptions[0]).value.split(" ");
 newAmount = itemQty*itemPrice[1];
 document.getElementById(itemOptions[0]).value = (newAmount + " " + itemPrice[2]);
 document.getElementById("totalAmount").innerHTML = ((Number(totalAmount[0]) - (Number(currentAmount[0] - newAmount))) + " " + itemPrice[2]);
}

function update_cart(thisItem)
{
 totalAmount = document.getElementById("totalAmount").innerHTML.split(" ");
 itemOptions = thisItem.split("_");
 itemQty = document.getElementById(itemOptions[0]).value;
 itemPrice = document.getElementById(itemOptions[2]).value.split("=")[3].split(" ");
 if (itemQty > 10) document.getElementById(itemOptions[0]).value = 10;
 if (itemQty <= 0) document.getElementById(itemOptions[0]).value = 1;
 currentAmount = document.getElementById(itemOptions[1]).value.split(" ");
 newAmount = itemQty*itemPrice[1];
 document.getElementById(itemOptions[1]).value = (newAmount + " " + itemPrice[2]);
 document.getElementById("totalAmount").innerHTML = ((Number(totalAmount[0]) - (Number(currentAmount[0] - newAmount))) + " " + currentAmount[1]);
}

function back_to_shopping()
{
 document.forms["shop"].submit();
}