var menuPreloadFlag = false;
var loadedImages = new Array();
var imageNames = new Array();

function init()
{
	//	Load header images.
	var nextName;
	var nextIndex;
	for (nextIndex in imageNames)
	{
		nextName = imageNames[nextIndex];
		loadedImages[nextName] = new Array(new Image(), new Image());
		loadedImages[nextName][0].src = '/images/rollovers/' + nextName + '-off.gif';
		loadedImages[nextName][1].src = '/images/rollovers/' + nextName + '-on.gif';
	}
	menuPreloadFlag = true;
}

function swapImageOn(imageName)
{
	if (document.images && menuPreloadFlag)
		document.images[imageName + 'Image'].src = loadedImages[imageName][1].src;
}

function swapImageOff(imageName)
{
	if (document.images && menuPreloadFlag)
		document.images[imageName + 'Image'].src = loadedImages[imageName][0].src;
}