function swapImage(imgName, imgSrc)
{
//alert("imgName = " + imgName);
//alert("imgSrc = " + imgSrc);

  theImgToSwap = eval('document.' + imgName);
  theImgToSwap.src = imgSrc;
}

function openWindow(windowURL, windowName, windowWidth)
{
  var windowWidth = 600;
  var windowHeight = 600;
  var screenWidth = (screen.width - windowWidth) / 2;
  var screenHeight = (screen.height - windowHeight) / 2;
  var popupWindowProperty;

  var windowProperty = 'top=' + screenHeight + ',left=' + screenWidth + ',width=' + windowWidth + ',height=' + windowHeight + ',menuBar=no,location=no,resizable=yes';

  popupWindow = window.open(windowURL, windowName, windowProperty);
  popupWindow.focus();
} // function openWindow(windowURL, windowName, windowWidth)