function newImage(arg) {
  if (document.images) {
    rslt = new Image();
    rslt.src = arg;
    return rslt;
  }
}

function changeImages() {
  if (document.images && (preloadFlag == true)) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
    }
  }
}

var preloadFlag = false;

function preloadImages() {
  if (document.images) {
    hm_enlist_over = newImage("l/g/website/images/hm_enlist-over.gif");
    hm_raise_over = newImage("l/g/website/images/hm_raise-over.gif");
    hm_collect_over = newImage("l/g/website/images/hm_collect-over.gif");
    hm_organize_over = newImage("l/g/website/images/hm_organize-over.gif");

    hm_center_over = newImage("l/g/website/images/hm_center-over.gif");
    hm_enlist_center = newImage("l/g/website/images/hm_enlist_center.gif");
    hm_raise_center = newImage("l/g/website/images/hm_raise_center.gif");
    hm_collect_center = newImage("l/g/website/images/hm_collect_center.gif");
    hm_organize_center = newImage("l/g/website/images/hm_organize_center.gif");

    preloadFlag = true;
  }
}

function queryString(key) {
  urlString = window.location.search.substring(1);
  qStr = urlString.split("&");
  for (i = 0; i < qStr.length; i++) {
    kvPair = qStr[i].split("=");
    if (kvPair[0] == key) {
      return kvPair[1];
    }
  }
}