자바스크립트 포커스 이동

<form name="frm">

<input name="mem1" type="text" size="6" maxlength="6" onkeyup="if(this.value.length == 6) frm.mem2.focus()">

<input name="mem2" type="text" size="7" maxlength="7" onkeyup="if(this.value.length == 7) frm.email.focus()">

<input name="email" type="text" size="30">

</form>