[script] 랜덤 배경 스크립트

<!-- 랜덤배경 -->
 <script type="text/javascript">
 var images = ['bg.jpg', 'bg2.jpg'];
 $('body').css({'background-image': 'url(./images/' + images[Math.floor(Math.random() * images.length)] + ')',"background-size": "cover","background-attachment": "fixed"});
</script>