function scrollImg(){
    var posX,posY;
    if (window.innerHeight) {
        posX = window.pageXOffset;
        posY = window.pageYOffset;
    }
    else if (document.documentElement && document.documentElement.scrollTop) {
        posX = document.documentElement.scrollLeft;
        posY = document.documentElement.scrollTop;
    }
    else if (document.body) {
        posX = document.body.scrollLeft;
        posY = document.body.scrollTop;
    }
    var ad=document.getElementById("Layer1");
    ad.style.top=(posY+145)+"px";
    ad.style.left=(posX+870)+"px";
    setTimeout("scrollImg()",100);
}
 function hidead()
 {
 document.getElementById("Layer1").style.display="none";
 }