function setOpacity(obj, opacity) {
  opacity = (opacity == 100)?99.999:opacity;
  
  // IE/Win
  obj.style.filter = "alpha(opacity:"+opacity+")";
  
  // Safari<1.2, Konqueror
  obj.style.KHTMLOpacity = opacity/100;
  
  // Older Mozilla and Firefox
  obj.style.MozOpacity = opacity/100;
  
  // Safari 1.2, newer Firefox and Mozilla, CSS3
  obj.style.opacity = opacity/100;
}

function fadeIn(objId,opacity) {
  if (document.getElementById) {
    obj = document.getElementById(objId);
    if (opacity <= 100) {
      setOpacity(obj, opacity);
      opacity += 5;
      window.setTimeout("fadeIn('"+objId+"',"+opacity+")", 200);
    }
    else {
        setOpacity(obj, opacity);
        window.setTimeout("fadeOut('" + objId + "'," + 100 + ")", 200);
    }
  }
}

function fadeOut(objId, opacity) {
    if (document.getElementById) {
        obj = document.getElementById(objId);
        if (opacity >= 0) {
            setOpacity(obj, opacity);
            opacity -= 5;
            window.setTimeout("fadeOut('" + objId + "'," + opacity + ")", 200);
        }
        else {
            swapImage(objId);
            setOpacity(obj, opacity);
            window.setTimeout("fadeIn('" + objId + "'," + 0 + ")", 200);
        }
    }
}

function swapImage(imageId) {
    	image = document.getElementById(imageId);
    	//image.src = "http://www.holdenstreetperformance.co.nz/images/" + Math.floor(Math.random() * 11) + ".gif";
	image.src = "images/" + Math.floor(Math.random() * 11) + ".gif";
}

function initImage(imageId) {
    image = document.getElementById(imageId);
    //setOpacity(image, 100);
    //image.style.visibility = 'visible';
    fadeOut(imageId, 100);
}