// Preload background images
jQuery.preloadImages = function() {
	var a = (typeof arguments[0] == 'object')? arguments[0] : arguments;
	for(var i = a.length -1; i > 0; i--) {
		jQuery("<img>").attr("src", a[i]);
	}
}

var imgs = [ 
		'/img/solution.gif',
		'/img/evolution.gif',
		'/img/revolution.gif'
];
	
$(document).ready(function() {

	$.preloadImages(imgs);
	var currImage=0;
	var timer = setInterval(     function nextImage()
		{
			$('#content').css('background-image', 'url('+imgs[currImage]+')');
			currImage = (currImage+1)%(imgs.length);
		}, currImage==2?3000:2000
	);
});