$(document).ready(function(){
				
				var imgArr = new Array( // relative paths of images
					'back/docs.jpg',
					'back/kid1.jpg',
					'back/docs.jpg',
					'back/bike1.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;
				changeImg();
				var intID = setInterval(changeImg, 6000);
				
				function changeImg(){
					$('#slideshow').animate({opacity: 0}, 200, function(){
						$(this).css('background','url(' + preloadArr[currImg++%preloadArr.length].src +') top center no-repeat');
					}).animate({opacity: 1}, 600);
				}
 
			});