function CheckEmailDomain(){var regExp = /[0-9a-zA-Z]([-_\.]?[0-9a-zA-Z])*\.[a-zA-Z]{2,3}$/i; IF(!regExp.test(document.frmApply.EmailDomain.value)){ document.frmApply.EmailDomain.value=""; document.frmApply.EmailDomain.focus(); alert("이메일 도메인형식이 올바르지 않습니다."); return false;} }