d = document;

/**
* ce (create element) funkcija sukuria elementa
* pvz.: inputas = ce('input', 'input_id', 'input_name', 'radio');
*/
function ce(type, id, name, innertype) {
    elem = document.createElement(type);

    try	{
        elem.id = id;
    }
    catch (exp) {
    }

    try	{
        elem.name = name;
    }
    catch (exp) {
    }

    try	{
        elem.type = innertype;
    }
    catch (exp) {
    }

    return elem;
}

function addEvent( obj, sType, fn )
{
    if (obj.addEventListener)
        {
        obj.addEventListener(sType, fn, false);
    } 
    else if (obj.attachEvent) 
        {
        var r = obj.attachEvent("on"+sType, fn);
    }
    else 
        {
        alert("Neimanoma prisieti veiksmo!");
    }
}

function change_amount(increase, elem_id) {
    try {
        elem = d.getElementById(elem_id);
        //alert(elem_id.substring(9));
        dc_user = elem_id.substring(9);
        u_id = d.getElementById("p_cart_user_"+elem_id.substring(9)).value;
        amount = elem.value;
        if(!is_numeric(amount, true)) {
            elem.value = "0";
            alert("Laukelyje turi buti sveikas skaicius!");
            return;
        }
        else
            amount = parseInt(amount);
    }
    catch(exp) {
        elem.value = "0";
        alert("Laukelyje turi buti sveikas skaicius!");
        return;
    }
    //dc_user != 2934 || dc_user != 2962 || dc_user != 2883 || dc_user != 2906 || dc_user != 2907 || dc_user != 2909
    if(increase) {
        if (dc_user != 2934 || dc_user != 2962 || dc_user != 2883 || dc_user != 2906 || dc_user != 2907 || dc_user != 2909) {
            if (((elem_id == 'p_amount_11306' || elem_id == 'p_amount_11307' || elem_id == 'p_amount_11308') && amount >= 10) || (elem_id == 'p_amount_12450' && amount >= 50)) {
                elem.value = amount;
            } else {
                amount++;
                elem.value = amount;
            }
        } else {
            amount++;
            elem.value = amount;
        }

    } else {
        if(amount > 0) {
            if (dc_user != 2934 || dc_user != 2962 || dc_user != 2883 || dc_user != 2906 || dc_user != 2907 || dc_user != 2909) {
                if (elem_id == 'p_amount_12450' && amount <= 10) {
                    elem.value = amount;   
                } else {
                    amount--;
                    elem.value = amount;
                }
            } else {
                amount--;
                elem.value = amount;
            }
        }
    }
}

function is_numeric(string, positive_only) {
    pos_valid_chars = "1234567890.";
    all_valid_chars = "1234567890.-";

    dots = 0;

    if(string.length == 0) 
        return false;

    for(i = 0; i < string.length && (dots <= 1); i++) {
        ch = string.charAt(i);

        if(ch == ".")
            dots++;

        // jeigu pirmas taskas iseinam
        if((i == 0) && (ch == '.')) 
            return false;

        // jeigu daugiau kaip 1 taskas, iseinam
        if(dots > 1)
            return false;

        if(positive_only) {
            if(pos_valid_chars.indexOf(ch) == -1) {
                return false;
            }
        }
        else {
            // ziurim pirma skaiciu, nes tik jis gali buti "-"
            if(i == 0) {
                if(all_valid_chars.indexOf(ch) == -1) {
                    return false;
                }
            }
            else {
                if(pos_valid_chars.indexOf(ch) == -1) {
                    return false;
                }
            }
        }
    }

    return true;
}

function money_format(num) {
    num = num.toString();
    has_dot = false;
    dot_pos = 0;
    if(is_numeric(num)) {
        for(i = 0; i < num.length; i++) {
            ch = num.charAt(i);
            if(ch == ".") {
                has_dot = true;
                dot_pos = i;
                break;
            }
        }

        if(has_dot) {
            if((dot_pos + 1) == num.length-1) {
                return (num.substr(0, dot_pos + 2) + "0");
            }
            else if(dot_pos == num.length-1) {
                return (num + "00");
            }
            else {
                return num.substr(0, dot_pos + 3);
            }
        }
        else {
            return num + ".00";
        }
    }
    return false;
}