var imgRootContext = "img/";
var imgSuffix = "_off.gif";
var imgOnSuffix = "_on.gif"
var imgNormal = new Array();
var imgOn = new Array();

// Image names
var imgNameArray = new Array('cart','support');

// Preload images
if (document.images)
{
	for (i = 0; i < imgNameArray.length; i++)
	{
		imgNormal[i] = new Image;
		imgNormal[i].src = imgRootContext + imgNameArray[i] + imgSuffix
		imgOn[i] = new Image;
		imgOn[i].src = imgRootContext + imgNameArray[i] + imgOnSuffix;
	}
}

// onMouseOver function
function buttonOn(imgNo)
{
	if (document.images)
		document.images[imgNameArray[imgNo]].src = imgOn[imgNo].src;
}

// onMouseOut function
function buttonOff(imgNo)
{
	if (document.images)
		document.images[imgNameArray[imgNo]].src = imgNormal[imgNo].src;
}