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/top_menu_hover.gif', 
		'images/button_act.jpg', 
		'images/slider_button_hover.png', 
		]);