레이어팝업 공지 (오늘 하루 열지 않기)

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 function setCookie( name, value, expirehours ) {
  var todayDate = new Date();
  todayDate.setHours( todayDate.getHours() + expirehours );
  document.cookie = name + "=" + escape( value ) + "; path=/; expires=" + todayDate.toGMTString() + ";"
 }
 function closeWin() {
  if(document.getElementById("pop_today").checked){
   setCookie( "ncookie", "done" , 24 );
  }
  document.getElementById('layer_pop').style.display = "none";
 }
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<div class="layer_popup" style="position:absolute; width:500px;left:50%; margin-left:-480px; top:90px; z-index:1;" id="layer_pop">
<table width="500" border="0" cellpadding="0" cellspacing="0">
<tr>
 <td><img src="images/popupimage.jpg" width="500" height="500" border="0" /></td>
</tr>
<tr>
 <td align="center" height="30" bgcolor="#333333">
 <table width="95%" border="0" cellpadding="0" cellspacing="0">
 <tr>
  <td align="left" class="pop"><input type="checkbox" name="pop_today" id="pop_today" />오늘 하루 이 창 열지 않음</td>
  <td align="right" class="pop"><a href="javascript:closeWin();">닫기</a></td>
 </tr>
 </table></td>
</tr>
</table>
<script language="Javascript" type="text/javascript">
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 cookiedata = document.cookie;
 if (cookiedata.indexOf("ncookie=done") < 0){
  document.getElementById('layer_pop').style.display = "inline";
 } else {
  document.getElementById('layer_pop').style.display = "none";
 }
-->
</script>
</div>
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