function initFadingImages(){	
	for(var i=0;i<$(".bannerItemTop").size();i++){
		startAnimation($(".bannerItemTop").eq(i), i);
	}
}
function startAnimation(obj, num){
	var cur = 0;
	var idInterval;
	
	function doBannerFading(){				
		clearInterval(idInterval);
		for(var i=0; i<$(obj).find("span").size(); i++){
			if(i == cur){				
				$(obj).find("span").eq(i).css("z-index", "10");
				$(obj).find("span").eq(i).animate({
					opacity: 1
				  }, 1000, function() {
					if(cur < $(obj).find("span").size() - 1){
						cur++;
					}
					else{
						cur=0;
					}
					setTimeout(doBannerFading, 3000);
				  });
			}
			else{
				$(obj).find("span").eq(i).css("z-index", "1");
				$(obj).find("span").eq(i).animate({
					opacity: 0
				  }, 1000, function() {
					
				  });					
			}	
		}		
	}
	doBannerFading();
}