function swapImage (_imgTagId, _imgSourceUrl, _caller)
    {
	var target = document.images[_imgTagId];
	if (!target || !_imgSourceUrl)
		return;

	if (target.prevLink)
		{
		target.prevLink.disabled = false;
		target.prevLink.style.color = target.prevLink.saveColor;
		target.prevLink.style.textDecoration = "none";
		}

	if (_caller)
		{
		var caller = document.getElementById(_caller);
		target.prevLink = caller;
		//caller.disabled = true;
		caller.saveColor = caller.style.color;
		caller.style.color = "#FF6D01";			//orange
		caller.style.textDecoration = "none";
		}

    target.src = _imgSourceUrl;
    }