드롭다운 메뉴,레이어이해

<script language =" javascript">

function show_sub(index)

{

if(index=='1')

{

menu1.style.visibility='visible';

}

if(index=='2')

{

menu2.style.visibility='hidden';

}

</script>

<div onmouseover=show_sub('1') onmouseout=show_sub('2')>

레이어 제어(클릭)

</div>

 

<div class='submenu' name=menu1 id=menu1 style='position:absolute;top:121px;left:121;visibility:hidden>

레이어1

</div>