var banners = new Array('/pic/bannernew1.jpg','/pic/frise.jpg','/pic/banner3717.jpg'); 
var count=0;
function switchBanner() {
	count = count+1;
	$('#banner_top_img').animate({ opacity: "0" }, 400, 'swing', function() { 
		$('#banner_top_img').attr({src:banners[count]}); 
		$('#banner_top_img').animate({ opacity: "1" }, 400, 'swing');
	} );	
	if  (count > 2)	count = 0;
}

$(document).ready(function () {
	$('#banner_top_img').attr({src:banners[0]}); 
	setInterval ( "switchBanner()", 6000 );
});