function InitBackgrounds() {

	var backgrounds=[ 
		"images/backgrounds/bg1.gif",
		"images/backgrounds/bg2.gif",
		"images/backgrounds/bg3.gif",
		"images/backgrounds/bg4.gif",
		"images/backgrounds/bg5.gif",
		"images/backgrounds/bg6.gif",
		"images/backgrounds/bg7.gif",
		"images/backgrounds/bg8.gif"
		];

	return backgrounds;
}

function GetRandomBackground() {
	var backgrounds = InitBackgrounds()
	var background_index = Math.floor(Math.random()*backgrounds.length);
	return backgrounds[background_index];
	
}

function SetBackground(backgroundURL)
{
	document.body.style.background='white url(' + backgroundURL + ')';
}


function SaveBackground(backgroundURL)
{
	SetBackground(backgroundURL);
	createCookie("BackgroundURL",backgroundURL,1)	
}

function ClearSavedBackground()
{
	eraseCookie("BackgroundURL");	
	SetBackground(GetRandomBackground());
}

function InitBackground()
{

	var backgroundURL = readCookie("BackgroundURL");
	if (backgroundURL) {
		SetBackground(backgroundURL);	
	}
	else {
		SetBackground(GetRandomBackground());
	}
}