주민등록번호 백 탭

<script>
function jumin_focus() //주민번호 숫자만 입력및 fouce 자동 이동
{
window.status = event.keyCode;
//if ((event.keyCode<48)||(event.keyCode>57)) event.returnValue=false;
//if (event.keyCode == 16) {
if (event.keyCode == 9 || event.keyCode == 16) {
//event.returnValue = false;
//document.form.jumin1.focus();
//document.form.jumin1.select();
return false;
}

if(document.form.jumin1.value.length > 5)
{
document.form.jumin2.focus()
}
}
</script>

<form name=form>
<input type=text name='name' size=10>
<p>
<input type=text name=jumin1 size=6 onkeyup="jumin_focus();">
-
<input type=text name=jumin2 size=7>
</form>