//幻灯片
$(document).ready(function () {
			var Len = $('#slider li').length,
		    LWidth = $('#slider li').width(),
			LPosition1 = ($(window).width() -LWidth)/2;
			$('.slider_con').css('left',LPosition1);
			$(window).resize(function(){
				var LPosition1 = ($(window).width() -LWidth)/2;
				$('.slider_con').css('left',LPosition1);
				});
			//alert(LWidth);
		for(i=0;i<Len;i++){
			$('#btnli').append('<a href="#"></a>');
			};
		$('#btnli a:first').addClass('cur');
		$('#slider ul').width(Len*LWidth);
		
		var index = 1;
		$('#btnli a').click(function(){
			var index = $('#btnli a').index(this);
			slide(index);
			});
		
		$('#btnli').hover(function(){
			if(Auto){clearInterval(Auto)}
			},function(){
				Auto = setInterval(function(){
				slide(index);
				index++;
				if (index>=Len){index=0;}
				},4000);
				});
		
		var Auto = setInterval(function(){
			slide(index);
			index++;
			if (index>=Len){index=0;}
			},4000);
			
		function slide(i){
			$('#btnli a').eq(i).addClass('cur').siblings().removeClass('cur');
		    $('#slider ul').stop().animate({marginLeft:-(i*LWidth)});
			}
        });