function preloadImages(imgs){
	
	var picArr = [];
	
		for (i = 0; i<imgs.length; i++){
			
				picArr[i]= new Image(100,100); 
				picArr[i].src=imgs[i]; 

			
			}
	
	}
preloadImages([
		'images/page4_big_img1.jpg',
		'images/page4_big_img2.jpg',
		'images/page4_big_img3.jpg',
		'images/page4_big_img4.jpg',
		'images/page4_big_img5.jpg',
		'images/page4_big_img6.jpg',
		'images/page4_big_img7.jpg',
		'images/marker_left_active.png',
		'images/marker_right_active.png']);