var lastImageID = "";
var rand1 = 0;
var useRand = 0;

function imgPreLoader(imgSrc)
{
	imgObj = new Image();
	imgObj.src = imgSrc;
}

function imgHoverOn(imgId)
{
	newImgSrc = addHover(document.getElementById(imgId).src);
	document.getElementById(imgId).src = newImgSrc;
	lastImageID = imgId;
}

function imgHoverOff()
{
	newImgSrc = removeHover(document.getElementById(lastImageID).src);
	document.getElementById(lastImageID).src = newImgSrc;
}

function addHover(source)
{	
	extractFileName = source.split("/");
	buildFilePath = extractFileName[0] + "/";
		
	for(a = 1; a < extractFileName.length - 1; a++)
	{
		buildFilePath = buildFilePath + extractFileName[a] + "/";
	}
	
	extractExt = extractFileName[a].split('.');
		
	newFileName = buildFilePath + extractExt[0] + "Hover." + extractExt[1];

	return newFileName;
}

function removeHover(source)
{
	extractFileName = source.split("Hover");
	newFileName = extractFileName[0] + extractFileName[1];

	return newFileName;
}

window.onload = function(e)
{	
	imgPreLoader('images/home.jpg');
	imgPreLoader('images/homeHover.jpg');
	imgPreLoader('images/clarkSite.jpg');
	imgPreLoader('images/clarkSiteHover.jpg');
	imgPreLoader('images/computeronixSite.jpg');
	imgPreLoader('images/computeronixSiteHover.jpg');
	imgPreLoader('images/kiserSite.jpg');
	imgPreLoader('images/kiserSiteHover.jpg');
	imgPreLoader('images/wpmSite.jpg');
	imgPreLoader('images/wpmSiteHover.jpg');
	imgPreLoader('images/homeforsaleHover.jpg');
	imgPreLoader('images/banner1.jpg');
	imgPreLoader('images/banner2.jpg');
	imgPreLoader('images/banner3.jpg');
	imgPreLoader('images/familyPicture.jpg');
	randomPicture();
}

function randomPicture()
{
	images = new Array;
	images[1] = new Image();
	images[1].src = "images/banner1.jpg";
	images[2] = new Image();
	images[2].src = "images/banner2.jpg";
	images[3] = new Image();
	images[3].src = "images/banner3.jpg";

	swapPic();
}

function swapPic()
{
	var imgnum = images.length - 1;
	do
	{
		var randnum = Math.random();
		rand1 = Math.round((imgnum - 1) * randnum) + 1;
	}
	while (rand1 == useRand);
	useRand = rand1;
	document.randimg.src = images[useRand].src;

	setTimeout("swapPic()", 4000);
}