层随着鼠标移动

层随着鼠标移动

var c = document.getElementById("divTool");
 c.style.position = "absolute";
 var eT = obj.offsetTop; 
    var eH = obj.offsetHeight+eT; 
 c.style.left = window.event.clientX-event.offsetX+document.documentElement.scrollLeft-20;
    c.style.top = window.event.clientY-event.offsetY+document.documentElement.scrollTop+eH-8;


 c.style.display = "block";