if (document.images){
var offImgArray = new Array();

offImgArray[0] = new Image(70,19);

offImgArray[0].src = "images/home.gif";

var onImgArray = new Array();
onImgArray[0] = new Image(70,19);

onImgArray[0].src = "images/home2.gif";

}
function imageOn(imgName)
{
	if (document.images)
	{
		document.images[imgName].src = onImgArray[imgName].src;
	}
}

function imageOff(imgName)
{
	if (document.images)
	{
		document.images[imgName].src = offImgArray[imgName].src;
	}
}