var d = document;

function get_xmlhttp() {
    var xmlhttp=false;

    /*@cc_on @*/
    /*@if (@_jscript_version >= 5)
    try {
    xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
    try {
    xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    } catch (E) {
    xmlhttp = false;
    }
    }
    @end @*/
    if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
        xmlhttp = new XMLHttpRequest();
    }

    return xmlhttp;
}

function insert_into_cart(prod_id, tmp_user) {
    xmlhttp = get_xmlhttp();
    error = false;

    try {
        elem_amount = d.getElementById("p_amount_" + prod_id);
        amount = check_if_valid(elem_amount.value); 
        if(amount == false)
            error = true;

        elem = d.getElementById("p_price_" + prod_id);
        price = check_if_valid(elem.innerHTML); 

        elem = d.getElementById("p_discount_" + prod_id);
        discount = check_if_valid(elem.innerHTML); 


        ud_elem = d.getElementById("user_discount");
        user_discounts = check_if_valid(ud_elem.innerHTML); 

        md_elem = d.getElementById("money_discount");
        money_discounts = check_if_valid(md_elem.innerHTML); 

        tc_elem = d.getElementById("total_cost");
        total_costs = check_if_valid(tc_elem.innerHTML); 

        dc_elem = d.getElementById("discounted_cost");
        discounted_costs = check_if_valid(dc_elem.innerHTML);

        current_amount = d.getElementById("p_curr_amount_"+prod_id);
        c_a = check_if_valid(current_amount.value);

        dc_user = d.getElementById("p_cart_user_"+prod_id).value;

        if (dc_user != 2934 || dc_user != 2962 || dc_user != 2883 || dc_user != 2906 || dc_user != 2907 || dc_user != 2909) {

            if (prod_id == 12450) {
                if (c_a + amount > 50) {
                     alert('Jeigu norite užsakyti didesnį kiekį nei maksimalus limitas, prašome kreiptis į savo administratorių.');
                     amount = 50 - c_a;
                } else if (c_a + amount < 10) {
                    amount = 10;
                }

            }

            //12450
            if ((prod_id == 11306 || prod_id == 11307 || prod_id == 11308) &&  (c_a + amount) > 10) {
                alert('Jeigu norite užsakyti didesnį kiekį nei maksimalus limitas, prašome kreiptis į savo administratorių.');
                amount = 10 - c_a;
            }
        }


        if(error) {
            alert("Netinkamas formatas!");
            elem_amount.value = 0;
            return;
        }
    }
    catch(exp) {
        alert(exp);
        alert("Prekes kaina ir kiekis turi buti skaiciai!");
        return;
    }

    xmlhttp.onreadystatechange = function() {
        if( xmlhttp.readyState == 1 )
            {
        }
        if( xmlhttp.readyState == 2 )
            {
        }
        if( xmlhttp.readyState == 3 )
            {
        }
        if( xmlhttp.readyState == 4 ) {
            arr = eval(xmlhttp.responseText);
            md = eval("arr[0] - arr[1]");
            tc_elem.innerHTML = money_format(arr[0]);
            dc_elem.innerHTML = money_format(arr[1]);
            md_elem.innerHTML = money_format(md);	
            d.getElementById("p_curr_amount_" + prod_id).value = c_a + amount;		
            d.getElementById("p_amount_" + prod_id).value = 0;
            d.getElementById("inside_cart").className = "full";
            d.getElementById("small_cart_" + prod_id).className = "small_full";
        }
    }

    if(tmp_user){
        url = "cart/bg_insert/?id=" + prod_id + "&amount=" + amount + "&tmp_user=1";
    }else{
        url = "cart/bg_insert/?id=" + prod_id + "&amount=" + amount;    
    }

    send_req(xmlhttp, url);

    return false;
}
// number as string
function check_if_valid(num) {
    if(!is_numeric(num)) {
        return false;
    }
    else {
        return parseFloat(num);
    }
}

function send_req(xmlhttp, url) {
    xmlhttp.open( "GET", url, true );
    if(navigator.userAgent.indexOf('ie') == -1)
        xmlhttp.send( null );
    else
        xmlhttp.send();
}