수직정렬 > JS

<script>
 $(document).ready(function(){

$(".left_m_btn").css("display","block");
$(".left_m_btn").css("top", Math.max(0, (($(window).height() - $(".left_m_btn").outerHeight()) / 2) +$(window).scrollTop()) + "px");
$(".left_m_btn").css("left","0px");
//$(".left_m_btn").css("left", Math.max(0, (($(window).width() - $(".left_m_btn").outerWidth()) / 2) +//$(window).scrollLeft()) + "px");

$(".right_m_btn").css("display","block");
$(".right_m_btn").css("top", Math.max(0, (($(window).height() - $(".right_m_btn").outerHeight()) / 2) +$(window).scrollTop()) + "px");
$(".right_m_btn").css("right","0px");

});
</script>