클릭위치로 레이어 띄우기

<script type="text/javascript">
function abspos(e){
    this.x = e.clientX + (document.documentElement.scrollLeft?document.documentElement.scrollLeft:document.body.scrollLeft);
    this.y = e.clientY + (document.documentElement.scrollTop?document.documentElement.scrollTop:document.body.scrollTop);
    return this;
}


function itemClick(e){
    var ex_obj = document.getElementById('lay');
    if(!e) e = window.Event;
    pos = abspos(e);
    ex_obj.style.left = pos.x+"px";
    ex_obj.style.top = (pos.y+10)+"px";
    ex_obj.style.display = ex_obj.style.display=='none'?'block':'none';
}
</script>

 

<div id="lay" style="position:absolute; display:none;">내용이 어쩌고 저쩌고</div>
<div style="padding:300px 0 0 200px;"><input type="button" onclick="itemClick(event);" value="클릭"></div>