//check for and read URL bubble cookies
function readCookie()
{
	if (document.cookie)
	{
		var bubble_cookie = document.cookie;
		var cookieCrumbleOne = bubble_cookie.split(";");
		var cookieStart = cookieCrumbleOne[0];
		var cookieCrumble = cookieStart.split("@");
		var endOfCookie = cookieCrumble.length -1;
		var bubblePref = cookieCrumble[endOfCookie];
		var bubblePref = unescape(bubblePref);
		if (bubblePref == 'stop')
		{
			controlSwitch('stop');
		}	else { 
		controlSwitch('start');
		startAnimation(cycleLayer()); 
		}
	} else { 
		controlSwitch('start');
		startAnimation(cycleLayer()); 
		
	}
} 

// define function for adding cookie for bubbles to move or not
function defBubblePref(StopORstart)
{
	// set expiration date
	var ExpireDate = new Date("October 31,2008");
	var cookieDate = ExpireDate.toGMTString();
	// build cookie
	var bubble_cookie = "bubblePref=yeaORnay@" + escape(StopORstart) + ";expires=" + cookieDate;
	document.cookie = bubble_cookie;
}

// Determine browser and load correct variables
var layerRef = "null", layerStyleRef = "null", styleSwitch = "null", pxSwitch = "null";
var is_ie = (document.all && document.getElementById);
var is_moz = (!document.all && document.getElementById);
var is_opera = (navigator.userAgent.indexOf("Opera") > -1);

function init()
{
if (document.getElementById) {
	layerStyleRef="layer.";
	layerRef="document.getElementById";
	styleSwitch="";
	pxSwitch="";
} else if (document.all){
	layerStyleRef="layer.style.";
	layerRef="document.all";
	styleSwitch=".style";
	pxSwitch="px";
} else if (document.layers) {
	layerStyleRef="layer.";
	layerRef="document.layers";
	styleSwitch="";
	pxSwitch="";
} 
}

// make control button work
function controlSwitch(sORs)
{
	init();
	if (sORs == 'stop')
	{
		eval(layerRef+'["buttonStop"]'+styleSwitch+'.visibility = "hidden"');
		eval(layerRef+'["buttonStart"]'+styleSwitch+'.visibility = "visible"');
	} else if (sORs == 'start') {
		eval(layerRef+'["buttonStart"]'+styleSwitch+'.visibility = "hidden"');
		eval(layerRef+'["buttonStop"]'+styleSwitch+'.visibility = "visible"');
	}
}

// load array to hold all animated layers 
var oneLayer = 0;

// cycle trough all layers
function cycleLayer()
{
	var allLayers = new Array('orb0','orb1','orb2','orb3','orb4','orb5','orb6','orb7')
	oneLayer++;
	if (oneLayer == 8)
	{
		oneLayer = 0;
	}
	return allLayers[oneLayer];
}

// create a random number between 0 and 10
function createRandom()
{
	var randomNumber = Math.round(Math.random()*10);
	return randomNumber;
}

// randomly decide if positive or naegative
function posORneg()
{
	var ranNum = Math.round(Math.random()*10);
	if (ranNum > 4)
	{
		var pOn = "+";
	} else {
		var pOn = "-";
	}
	return pOn
}

// start animation and determine which way to move object
function startAnimation(layerName)
{
	var farthestLeft = 3+pxSwitch;
	var farthestRight = 52+pxSwitch;
	var farthestTop = -50+pxSwitch;
	var restartNum =600+pxSwitch;
	init();
	if 	(eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.top <= farthestTop'))
	{
		eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.top = restartNum');
	}
	if 	(eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.left <= farthestLeft'))
	{
		posMove(layerName);
	} else {
		if 	(eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.left >= farthestRight'))
		{
			negMove(layerName);
		} else {
			randomMove(layerName);
		}
	}
}

// if the object is too close to the left, move it to the right
function posMove(layerName)
{
	var topPix =  "-" + createRandom();
	var leftPix =  "+" + createRandom();
	moveLayerBy(layerName,leftPix,topPix);
}

// if the object is too close to the right, move it to the left
function negMove(layerName)
{
	var topPix =  "-" + createRandom();
	var leftPix =  "-" + createRandom();
	moveLayerBy(layerName,leftPix,topPix);
}

// if the object is in the middle, move it in a random direction
function randomMove(layerName)
{
	var topPix =  "-" + createRandom();
	var leftPix =  posORneg() + createRandom();
	moveLayerBy(layerName,leftPix,topPix);
}

// this funtion collects all the coordinates, moves the objects, and sets the process to begin again
function moveLayerBy(layerName,leftPix,topPix)
{
	var timeStop = Math.round((createRandom()*10)/6);
	var topCoord = eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.top');
	var leftCoord = eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.left');
	var testString = leftCoord.toString();
	var lastChar = testString.charAt(testString.length - 1);
	if (lastChar =='x')
	{	
		var leftNumL = leftCoord.length - 2;
		var topNumL = topCoord.length - 2;
		var fixTopCoord = topCoord.substring(0,topNumL);
		var fixLeftCoord = leftCoord.substring(0,leftNumL);
	} else { 
		var fixLeftCoord = leftCoord;
		var fixTopCoord = topCoord;
	}
	var newTopCoord = eval(fixTopCoord+topPix) + pxSwitch;
	var newLeftCoord = eval(fixLeftCoord+leftPix) + pxSwitch;
	eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.top = newTopCoord');
	eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.left = newLeftCoord');
	bubbleTime = setTimeout('startAnimation("' + cycleLayer() + '")', timeStop)
}