$(function (){
			var i = 1;
			var total = 0;
			var pre = 0;
			$.each($(".ad"),function(){total++;});
			$(".ad").css("display","none");
			$("#ad"+i).css("display","");
	setInterval(showad,4000);
	function showad(){
		if(i==1){
			pre = total;
		}else{
			pre = (i-1);
		}
		$("#ad"+pre).fadeOut("slow"); 
		$("#ad"+pre).css("display","none");
		$("#ad"+i).fadeIn("slow");
		$("#ad"+i).css("display","");
		if(i==total){
			i=1;
		}else{
			i=i+1;
		}
	}
							 })

function gourl(){
	var url = $(this).val();
	if(url!=""){
		document.location.href = url;
	}
}
$(document).ready(function (){
	$("#pageslt").change(gourl);						
	$(".topbiaodan").change(gourl);					 
							 });