function swapImg(imgName, state)
{
	if(imgName != "")
	{
		var imgSrc = document.images[imgName].src;
		if(state)
		{
			imgSrc = imgSrc.replace("_off", "_on");
			document.images[imgName].src = imgSrc;
		}
		else
		{
			imgSrc = imgSrc.replace("_on", "_off");
			document.images[imgName].src = imgSrc;
		}
	}
}