aImg = new Image();
aImg.src = "aFlat.gif";
aImgL = new Image();
aImgL.src = "aLite.gif";

bImg = new Image();
bImg.src = "bFlat.gif";
bImgL = new Image();
bImgL.src = "bLite.gif";

cImg = new Image();
cImg.src = "cFlat.gif";
cImgL = new Image();
cImgL.src = "cLite.gif";

dImg = new Image();
dImg.src = "dFlat.gif";
dImgL = new Image();
dImgL.src = "dLite.gif";

eImg = new Image();
eImg.src = "eFlat.gif";
eImgL = new Image();
eImgL.src = "eLite.gif";

fImg = new Image();
fImg.src = "fFlat.gif";
fImgL = new Image();
fImgL.src = "fLite.gif";

function getWindowHeight() {
  var windowHeight = 0;
  if (typeof(window.innerHeight) == 'number') {
      windowHeight = window.innerHeight;
  } else {
      if (document.documentElement && document.documentElement.clientHeight) {
        windowHeight = document.documentElement.clientHeight;
      } else {
          if (document.body && document.body.clientHeight) {
              windowHeight = document.body.clientHeight;
          }
      }
  }
  return windowHeight;
}