function userInfo(){
     var sendDay=new Date();
     document.mailForm.Info.value="Browser : "+navigator.userAgent;
     document.mailForm.Info.value+="Date : "+sendDay;
   }

   function about(){
     with(document.mailForm){
         action="mailto:tfuki@anet.ne.jp?subject="+subject.value;
     }
   }

   function formCheck(){
     var passed=false;
     with(document.mailForm){
       if(Name.value==""){
         alert("名前を入力して下さい。");
         Name.focus();
       } else if(subject.value==""){
        alert("件名を入力して下さい。");
         subject.focus();
       } else if(Address.value==""){
         if(confirm("〒住所を入力して下さい。")){
           about();
           passed=true;
         }
       } else {
         about();
         passed=true;
       }
       return passed;
     }
   }