function GetBigJpgCoordinate(e)
{
    var x=e.offsetLeft,y=e.offsetTop;   
    while(e=e.offsetParent) 
    { 
       x+=e.offsetLeft;   
       y+=e.offsetTop;
    } 
    return {left:x,top:y}
}

var littleImg; //littleImg为贴上的小图
var sLImg
function overlapImg(obj,sLImg)
{

    if(sLImg == 2)
    {
      littleImg = "Uploads\\chartlet\\2.gif";
    }
    else if(sLImg == 3)
    {
      littleImg = "Uploads\\chartlet\\3.gif";
    }
    else if(sLImg == 4)
    {
      littleImg = "Uploads\\chartlet\\4.gif";
    }
    else if(sLImg == 5)
    {
      littleImg = "Uploads\\chartlet\\5.gif";
    }
    else if(sLImg == 6)
    {
      littleImg = "Uploads\\chartlet\\6.gif";
    }
    else if(sLImg == 7)
    {
      littleImg = "Uploads\\chartlet\\7.gif";
    }
    else if(sLImg == 8)
    {
      littleImg = "Uploads\\chartlet\\8.gif";
    }
    else
    {
      return false;
    }
    
    if(!obj)return false;
    var t=new Image();
    t.src=littleImg;
    t.style.position="absolute";
    t.style.display="none";
    
    var w=obj.clientWidth;
    var h=obj.clientHeight;
    var o=GetBigJpgCoordinate(obj);//获取大图的绝对位置
    var tl=o.left+(w-t.width);
    var tt=o.top+(h-t.height);
    t.style.left=tl;
    t.style.top=tt;
    document.body.appendChild(t);//在页面中加入tip图
    t.style.display='block';
}