// JavaScript Document
function chk(){
    var myName = document.getElementById("MyName");
    var myEmail = document.getElementById("MyEmail");
    var ToName = "";
    var ToEmail = "";
    var j = 0;
    
    if(Trim(myName.value)==""){
        window.alert("請填上你的姓名");
        myName.select();
        return false;
    }
    if(Trim(myEmail.value)==""){
        window.alert("請填上你的電子郵件");
        myEmail.select();
        return false;
    }else{
        if(!emailCheck(myEmail, "電子郵件錯誤")){
            return false;
        }
    }

    for(var i=1;i<4;i++){
        ToName = eval("document.getElementById('ToName"+i+"')");
        ToEmail = eval("document.getElementById('ToEmail"+i+"')");
        
        if(Trim(ToName.value)!="" || Trim(ToEmail.value)!=""){
            if(Trim(ToName.value)==""){
            window.alert("請填上朋友 " + i + " 的姓名");
            ToName.select();
            return false;
            }
            if(Trim(ToEmail.value)==""){
                window.alert("請填上朋友" + i + "的電子郵件");
                ToEmail.select();
                return false;
            }else{
                if(!emailCheck(ToEmail, "電子郵件錯誤")){
                    return false;
                }
            }
        }else{
         j++;
        }
    }
    if(j>=3){
        window.alert("最少要填寫一個朋友");
        return false;
    }


    return true;
}