function divBlock_event_mousedown(e)
    {
        var obj,e,temp;
        obj = document.getElementById("divBlock");
        //得到该div的位置
        e = window.event?window.event:e;
        obj.startX=e.clientX-obj.offsetLeft;
        obj.startY=e.clientY-obj.offsetTop;
        //注册鼠标的移动事件
        document.onmousemove=document_event_mousemove;
        //为鼠标弹起帮定一个事件 （document.attachEvent IE）
        temp=document.attachEvent?document.attachEvent("onmouseup",document_event_mouseup):
        document.addEventListener("mouseup",document_event_mouseup,"");
    }
    //处理鼠标移动
    function document_event_mousemove(e)
    {
        var e, obj;
        obj=document.getElementById("divBlock");
        //改变div的位置
        e=window.event?window.event:e;
        with(obj.style)
        {
            position="absolute";
            left=e.clientX-obj.startX+"px";
            top=e.clientY-obj.startY+"px";
        }
    }
    //处理鼠标弹起
    function document_event_mouseup()
    {
        var temp;
        //取消鼠标移动事件的帮定
        document.onmousemove="";
        //取消鼠标弹起事件的帮定
        temp=document.detachEvent?document.detachEvent("onmouseup",document_event_mouseup):
        document.removeEventListener("mouseup",document_event_mouseup,"");
    }