$(document).ready(function() {

    $("#manual_disel").change(function() {
        if ($("#manual_disel").children("*").length == 61) {
            $("#manual_petrol").children("*").remove();
            var amount = $("#manual_disel").val();
            
            if (amount == 0) {
                for (var i = 0; i <= 60; i++) {
                    $("#manual_petrol").append(
                        $("<option></option>").attr("value", i).text(i)
                    );
                }
            } else {
                for (var i = 0; i <= 60; i++) {
                    if ((amount*1+i)%6 == 0 && (amount*1+i) <= 60) {
                        $("#manual_petrol").append(
                            $("<option></option>").attr("value", i).text(i)
                        );
                    }
                }
            }
        }
    });
    
    $("#manual_petrol").change(function() {
        if ($("#manual_petrol").children("*").length == 61) {
            $("#manual_disel").children("*").remove();
            var amount = $("#manual_petrol").val();
            
            if (amount == 0) {
                for (var i = 0; i <= 60; i++) {
                    $("#manual_disel").append(
                        $("<option></option>").attr("value", i).text(i)
                    );
                }
            } else {
                for (var i = 0; i <= 60; i++) {
                    if ((amount*1+i)%6 == 0 && (amount*1+i) <= 60) {
                        $("#manual_disel").append(
                            $("<option></option>").attr("value", i).text(i)
                        );
                    }
                }
            }
        }
    });
    
    $("#copy_address").click(function(event) {
        event.preventDefault();
        $("input[name='destination_city']").val($("input[name='billing_city']").val());
        $("input[name='destination_zip_code']").val($("input[name='billing_zip_code']").val());
        $("input[name='destination_address']").val($("input[name='billing_address']").val());
    });
    
    $("#new_captcha").click(function(event) {
        event.preventDefault();
        var rand = Math.floor(Math.random()*10001);
        var new_captcha = "webshop_captcha.php?id=" + rand;
        $("#captcha").attr("src", new_captcha);
    });    

});