function checkMail(){
    var emailExp = /^(([^<>()\[\]\\.,;:=/{}+!\s@']+(\.[^<>()\[\]\\.,;:=/{}+!\s@]+)*)|('.+'))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    if(checking('#emailEvaluate', emailExp)){
      $('#emailEvaluate').removeClass('error');
      $('#emailAlertText').addClass('hidden');