function navigateToSelection(select)
{
    var uri = select.options[select.selectedIndex].value;
    
    if (uri != "")
        location.href = uri;
}

var lastGuide, lastGuideOffImage;

function guideOn(guide, image)
{
  if (lastGuide)
    setGuideImage(lastGuide, lastGuideOffImage);

  setGuideImage(guide, image);
}

function setGuideImage(guide, image)
{
  var node = guide.childNodes[0];

  lastGuide = guide;
  lastGuideOffImage = node.src;
  
  node.src = image;
}

function getQueryStringParam(name)
{
  if (location.search && location.search.length > 1)
  {
    var qs = location.search.substr(1);
    var pairs = qs.split("&");

    for (var i = 0; i < pairs.length; i++)
    {
      var chop = pairs[i].split("=");

      if (chop.length == 2 && name == decodeURI(chop[0]))
        return decodeURI(chop[1]);
    }
  }

  return null;
}