if (document.images)
{
	imageOn = new Image();
	imageOn.src = "/images/left_bullet_on.gif";
	
	imageOff = new Image();
	imageOff.src = "/images/left_bullet_off.gif";
}

function imgOn(imageName)
{
	if (document.images)
	{
		document[imageName].src = imageOn.src;
	}
}

function imgOff(imageName)
{
	if (document.images)
	{
		document[imageName].src = imageOff.src;
	}
}