function ajax_email_ch() {
 var email1 = $("#email1").val();
 var email2 = $("#email2").val();

 var email_ch = email1 + "@" + email2;
   if(email_ch.match(/\w+[/\w.]*@[/\w.]+\.\w+/)) {
     이메일이 맞을경우...
   }
 }