$(document).ready(function(){
		var imgArr = new Array( // relative paths of images
			'images/bg-main01.jpg',
			'images/bg-main02.jpg',
			'images/bg-main03.jpg',
			'images/bg-main04.jpg'
			);
 
		var preloadArr = new Array();
		var i;
 
		/* preload images */
		for(i=0; i < imgArr.length; i++){
			preloadArr[i] = new Image();
 			preloadArr[i].src = imgArr[i];
		}
 
		var currImg = 1;
		var intID = setInterval(changeImg, 12000);
 
		/* image rotator */
		function changeImg(){
			$('#bodyMAIN').animate({opacity: 1}, 1000, function(){
				$(this).css('background','#000000 url(' + preloadArr[currImg++%preloadArr.length].src +') top center no-repeat fixed');
			}).animate({opacity: 1}, 1000);
		}

	});