var TableRowId = "quantityTableRow";
var PriceSpanID = "priceSpan";
var priceSpanBigID = "priceSpanBig";
var ProductQuantityInputID = "productQuantityInput";
var CurrentProductID = "CurrentProductID";
var AddToCartFormID = "AddToCartForm";
var TableRowsCount = 15; 
var previousID = 0;

function SetPriceByQuantity(amount){
    if(amount.length==0){
        return;
    }
    amount = amount*1;
    var price = QuantityAJAXService.GetPrice(amount);
    if(price.CanOrder){
        //set price
        $(PriceSpanID).innerHTML = price.Price;
        $(priceSpanBigID).innerHTML = price.Price;
        //unstyle previous
        $(TableRowId + previousID).style.backgroundImage = "";
        previousID = price.MatchIndex;
        //style new
        $(TableRowId + price.MatchIndex).style.backgroundImage = "url(http://www.kalvos.cz/images/products/thead.png)";
        //set product id to -1
        $(CurrentProductID).value = -1;
    }
    //user can add to cart
    if(price.CanOrder){
        $(AddToCartFormID).action = ShoppingCartAddUrl; 
    } else { 
        $(AddToCartFormID).action = "javascript:alert('Není objednán minimální počet kusů. ');";
    }
}