<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
 <HEAD>  <TITLE> New Document </TITLE> </HEAD>
 <script>
  function ff(a,b){
   alert(a+b);
  }
</script>
 <BODY>

<input id=b  type=button value="  문자로  " onclick='ff("3","4");'>
<input id=c  type=button value="   숫자로  " onclick="ff(3,4);">
 </BODY>
</HTML>