var imgLogo = new Array("img/logo1.gif",
							"img/logo2.gif",
							"img/logo3.gif",
							"img/logo4.gif",
							"img/logo5.gif",
							"img/logo6.gif");

var imgNum = imgLogo.length;
var c = 0;

function startLogoRotation()
{
preloadImages();
swapLogoImage();
}

function swapLogoImage()
{
	if (c == imgNum)
	{
		c = 0;
	}
	document.getElementById('header').style.background = "#fff url("+imgLogo[c]+") no-repeat 10% center";
	c++;

	setTimeout("swapLogoImage()", 5000);
}

function preloadImages()
{
	imageObj = new Image();

	for (var i = 0; i < imgNum; i++)
	{
		imageObj.src = imgLogo[i];
	}
}