var isIE = false;
var comp = navigator.appName;
if (comp.indexOf("Microsoft") >= 0) {
    isIE = true;
}

// test function for debugging internals
function test()
{
 var s = "";

 for(var i = 1; i <= parent.shop.orderNum; i++)
    s += parent.shop.orderList[i].anzahl + " x " + parent.shop.orderList[i].name + "\n";

 alert("DataBase Input:\n" + s);
}

function MyEval(form, str) {
     //alert(form.name +"."+ str);
        if (isIE) {
               return eval(form.name +"."+ str);
        }
        else {
               return form.eval(str);
        }
}

function ChangeTxt(form, form1) {
    var x, h;

var str="quantity"; // as the edit box name
var num=form.name.substring(str.length, form.name.length); // got the row number

    h = "num" + num + ".value"; // numX.value
    // num - MAX quantity of available items
    n  = parseInt(MyEval(form1, h));
    nv = parseInt(form.value);

    if (form.value != "" && form.value != "0" && !isNaN(nv))
         {
            if (nv < 0) {
                alert("Отрицательное значение!!!");
                form.value = 1;
                form.select();
                form.focus();
                return false;
            }

            if (nv > n) {
		message = "Максимальное количество одного продукта в заказе" + ": " + n ;
                alert(message);
                form.value = MyEval(form1, h);
                form.select();
                form.focus();
                return false;
            }

            n = form.value;

            isbn  = MyEval(form1, "isbn" + num + ".value");
            title = MyEval(form1, "title" + num + ".value");
            price = MyEval(form1, "price" + num + ".value");
            link  = MyEval(form1, "link" + num + ".value");
            maxitem = MyEval(form1, "num" + num + ".value");
            index = MyEval(form1, "index" + num + ".value");

            parent.shop.addOrderElem(n, title, isbn, price, link, maxitem, index);
    }
    else {
        n=0;
        form.value = "";
            isbn  = MyEval(form1, "isbn" + num + ".value");
            title = MyEval(form1, "title" + num + ".value");
            price = MyEval(form1, "price" + num + ".value");
            link  = MyEval(form1, "link" + num + ".value");
            maxitem = MyEval(form1, "num" + num + ".value");
            index = MyEval(form1, "index" + num + ".value");

           parent.shop.addOrderElem(-n, title, isbn, price, link, maxitem, index);
        // remove this order string from list

    }
    return true;
}
// end of checks.js