//详细信息的显示跟隐藏
        function showDetails()
        {
            var cbMore = document.getElementById("cbMore");
            if(cbMore.checked)
            {
                document.getElementById("DivDetails").style.display="block";
            }
            else
            {
                document.getElementById("DivDetails").style.display="none";
            }
        }
        //必填项的非空验证
        function formValidate()
        {
             var txtEmail = document.getElementById("txtEmail");
             document.getElementById("spanEmail").style.display="none";
             if(txtEmail.value == "")
             {
                document.getElementById("spanEmail").style.display="block";
                document.getElementById("txtEmail").focus();
                return false;
             }
             else
             {
                if(isEmail(txtEmail.value) == true)
                {
                     var txtPhone = document.getElementById("txtPhone");
                     var txtTopic = document.getElementById("txtTopic");
                     document.getElementById("spanTopic").style.display="none";
                     if(txtTopic.value == "")
                     {
                        document.getElementById("spanTopic").style.display="block";
                        document.getElementById("txtTopic").focus();
                        return false;
                     }
                     
                     var txtQuestionContent = document.getElementById("txtQuestionContent");
                     document.getElementById("spanQuestionContent").style.display="none";
                     if(txtQuestionContent.value == "")
                     {
                        document.getElementById("spanQuestionContent").style.display="block";
                        document.getElementById("txtQuestionContent").focus();
                        return false;
                     }
                }
                else
                {
                    return false;
                }
             }
         }
         
         //邮件正则表达式验证
         function isEmail(str) {
            //定义正则表达式不能用引号引起来
            //var myReg = /^[-_A-Za-z0-9]+@([_A-Za-z0-9]+.)+[A-Za-z0-9]...{2,3}$/;
            var myReg =/^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$/;
            document.getElementById("spanEmail").style.display="none";
            document.getElementById("spanEmail2").style.display="none";
            if(str != "")
            {
                if(myReg.test(str))
                {
                    document.getElementById("spanEmail2").style.display="none";
                    return true;
                }
                document.getElementById("spanEmail2").style.display="block";
                return false;
            }
            else
            {
                document.getElementById("spanEmail").style.display="block";
            }
        }