function btnsubmit() {

    checkform();
}

function checkform() {

    if (document.getelementbyid("title").value == "") {
        alert("please enter your address.");
        document.getelementbyid("title").focus();

        return false;
    }

    if (document.getelementbyid("tel").value == "") {
        alert("please enter your phone number.");
        document.getelementbyid("tel").focus();

        return false;
    }
    else {

        var mobilerule = /^1[3|4|5|8][0-9]\d{8}$/; //验证手机
        var telephonerule = /^\d{3,4}-?\d{7,11}$/;

        if (document.getelementbyid("tel").value.length == 11 && document.getelementbyid("tel").value.indexof("-") == 0) {
            if (!mobilerule.test(document.getelementbyid("tel").value)) {

                document.getelementbyid("tel").focus();
                alert("please fill in the correct phone number or cell phone number");

                return false;
            }
        }
        else {


            if (!telephonerule.test(document.getelementbyid("tel").value)) {
                document.getelementbyid("tel").focus();
                alert("please fill in the correct phone or mobile phone number, the phone needs to take a number, such as: 020-");

                return false;
            }
        }
    }



  

   

   
    if (document.getelementbyid("content").value == "") {
        alert("please enter your message.");
        document.getelementbyid("content").focus();

        return false;
    }

    $.ajax({
        type: "post",
        url: "/ajax/message.aspx?title=" + $("#title").val() + "&tel=" + $("#tel").val() + "&content=" + $("#content").val() + "&randroom=" + math.random(),
        data: "",
        success: function (data) {
            if (data == "1") {
                alert("message success, customer service will contact you within 72 hours.");
            }
            else {
                alert("message exception, please re");
            }
            location.href = document.url;
        }

    });

}