function checkEmail(email) {
    chars = " /:,;"

    for (i = 0; i<chars.length; i++) {
      nonChar = chars.charAt(i)
      if (email.indexOf(nonChar,0) > -1) {
        return false
      }
    }
    atMark = email.indexOf("@",1)
    if (atMark == -1) {
      return false
    }
    if (email.indexOf("@",atMark+1) != -1) {	
      return false
    }
    periodP = email.indexOf(".",atMark)
    if (periodP == -1) {
      return false
    }
    if (periodP+3 > email.length) {
      return false
    }
    return true
  }



 function checkForm(form) {

  if(form.name.value==""){
  alert("ご氏名をご記入ください。")
 form.name.value="";
  form.name.focus()
  form.name.select()
  return false
  }

    if(!checkEmail(form.email.value)) {
  alert("Eメールアドレスの記述に誤りがあります。\n再度ご確認ください。\n---（例）your@provider.co.jp---")
  form.email.focus()
  form.email.select()
  return false
  }


return true
}