绝对定位 位置确定

function ShowSpecDetail(obj,width, index) {
                var div = document.getElementById("div_spec_" + index);
                
                //div.style.left = "10px";

                var xx = obj.offsetLeft, yy = obj.offsetTop;
                var x = 0, y = 0;
                while (obj = obj.offsetParent) {
                    x += obj.offsetLeft;
                    y += obj.offsetTop;
                }
                //alert("x:" + x + "," + "y:" + y);
                div.style.top = y;
                div.style.left = x - width - xx;
                //alert(document.body.offsetWidth + " " + document.body.clientWidth + " " + screen.width);
                //alert("scrollWidth:" + div.scrollWidth + " scrollLeft:" + div.scrollLeft + " scrollTop:" + div.scrollTop + " offsetLeft:" + div.offsetLeft + " offsetTop:" + div.offsetTop);
                //alert("scrollWidth:" + obj.scrollWidth + " scrollLeft:" + obj.scrollLeft + " scrollTop:" + obj.scrollTop + " offsetLeft:" + obj.offsetLeft + " offsetTop:" + obj.offsetTop);
                div.style.display = div.style.display == "block" ? "none" : "block";
            }