function placeGateHouse()
{
    var mainX = document.getElementById('main').offsetLeft;
    var mainY = document.getElementById('main').offsetTop;
    
    mainXm = mainX - 29;
    mainYm = mainY + 208;
    
    document.getElementById('hp_ad').style.left = mainXm + "px";
    document.getElementById('hp_ad').style.top = mainYm + "px";
}