function showCallout(house)
{
    var coords = houses[house][2].split(',');
    var offsetX = 0;
    var offsetY = 0;
    for (i=0; i<coords.length; i++) {
        if (0 == i % 2) {
            offsetX += parseInt(coords[i]);
        } else {
            offsetY += parseInt(coords[i]);
        }
    }
    offsetX = offsetX / (coords.length / 2);
    offsetY = offsetY / (coords.length / 2);

    // Resolve callout new coordinates
    var area = document.getElementById('area');
    var startX = findPosX(area) + parseInt(offsetX) - 185 + 6;
    var startY = findPosY(area) + parseInt(offsetY) - 109 + 8;

    // Position callout
    var callout = document.getElementById('callout');
    callout.style.left = startX + 'px';
    callout.style.top  = startY + 'px';

    activeHouse = house;
    callout.className = 'callout';

    callout.innerHTML = houses[house][1];
}
function findPosX(obj)
{
    var curleft = 0;
    if(obj.offsetParent)
        while(1)
        {
          curleft += obj.offsetLeft;
          if(!obj.offsetParent)
            break;
          obj = obj.offsetParent;
        }
    else if(obj.x)
        curleft += obj.x;
    return curleft;
}
function findPosY(obj)
{
    var curtop = 0;
    if(obj.offsetParent)
        while(1)
        {
          curtop += obj.offsetTop;
          if(!obj.offsetParent)
            break;
          obj = obj.offsetParent;
        }
    else if(obj.y)
        curtop += obj.y;
    return curtop;
}