$(function(){
	/*首页头部置顶*/
	var tab_index = function(){
			
			var warp_hg = $('.banner').height();
			$(window).scroll(function(){
				
				var scroll_top = $(this).scrollTop()
				if(scroll_top>warp_hg){
					
					$('.header1').hide();
					$('.header2').show().stop(true,false).animate({'top':0},450)
					
					}
					
					else{
						
						$('.header1').show();
						$('.header2').stop(true,false).hide().css('top','-71px')
						
						}
						
				
				})
			
			}
			
		$(window).load(function(){
			
			tab_index()
			
			})	
	
	/*首页banner*/
	$(window).resize(function(){
			
		
		var w_height = $(window).height()
		var w_width = $(window).width()
		var sub_wid = $('.nav1').width()
		var t_wd = 1200-(sub_wid+122+300)
			
		var rate=950/1920;					
		
		if((w_height/w_width)>=rate){
					
			$(".banner li img").css({width:$(window).height()/rate,height:w_height,marginTop:-w_height/2});	
			$('.banner,.banner_list,.banner_list li').css('height',w_height)
			$(".sub_nav,.sub_ser").css({width:$(window).height()/rate,marginLeft:-($(window).height()/rate)/2});	
			
			}else{
				$(".banner li img").css({width:w_width,height:w_width*rate,marginTop:-(w_width*rate)/2});
				$('.banner,.banner_list,.banner_list li').css('height',w_width*rate)
				$(".sub_nav,.sub_ser").css({width:w_width,marginLeft:-(w_width/2)});
			
			}
		
		})	
		
		$(window).resize();		
	
})