function doSubmit()
{
    if(document.getElementById("txtName").value=="")
    {
       alert("請輸入姓名！");
       document.getElementById("txtName").focus();
       return false; 
    }
    if(document.getElementById("txtMsn").value!="")
    {
        if(!chkEmail(document.getElementById("txtMsn").value))
        {
           alert("Msn輸入錯誤！");
           document.getElementById("txtMsn").focus();
           return false; 
        }
    }
    if(document.getElementById("txtEmail").value!="")
    {
        if(!chkEmail(document.getElementById("txtEmail").value))
        {
           alert("電子郵件輸入錯誤！");
           document.getElementById("txtEmail").focus();
           return false; 
        }
    }
    if(document.getElementById("txtSubject").value=="")
    {
       alert("請輸入主題！");
       document.getElementById("txtSubject").focus();
       return false; 
    }
    if(document.getElementById("txtContents").value=="")
    {
       alert("請輸入留言内容！");
       document.getElementById("txtContents").focus();
       return false; 
    }
    if(document.getElementById("txtValidateCode").value=="")
    {
       alert("請輸入驗證碼！");
       document.getElementById("txtValidateCode").focus();
       return false; 
    }
}

function doReset()
{
    this.form.reset();
    return false;
}