var logos=[
'/images/logo1.jpg','/images/logo2.jpg','/images/logo3.jpg','/images/logo.jpg'
];
var currentlogo=0;
var repeated=0;

function SetupRotateLogo()
{
	setTimeout('RotateLogo()',2000);
	//pre load logos
	logos.each(function (logo) {
		var i=new Element('img',{src: logo});
	});
}
function RotateLogo()
{
	repeated++;
	if(repeated<40)
	{
		setTimeout('RotateLogo()',500);
	}
	$('logo').setStyle({backgroundImage:'url('+logos[currentlogo]+')'});
	currentlogo++;
	currentlogo%=logos.length;
}