//内页侧边栏固定悬浮
	  function side_absolute(left,right,wrap){
		      var about_l_height=left.outerHeight(true);
		      var about_con=right.outerHeight(true);

		      function run(){
				  if( about_con>about_l_height ){ //右侧的内容高度比左侧导航高时才触发
					  if( (($(window).scrollTop()-150)+about_l_height)>=about_con &&  $(window).height()>about_l_height){    //判断是否到容器底部了
						  left.css({position:'relative',left:'0px',top:about_con-about_l_height});
					  }else if($(window).scrollTop()>=150 && $(window).height()>about_l_height && about_con>about_l_height){
						  right.addClass('float_r');
						  wrap.css({position:'relative'});
						  left.css({position:'fixed',left:wrap.offset().left,top:0});
					  }else if( $(window).scrollTop()<150 ) {
						  left.css({position:'static',left:'0px'});
					  }else if($(window).height()<about_l_height){
						  left.css({position:'static',left:'0px'});
					  }
				  }
			  }


			  $(window).scroll(function(){
				  run()
			  });


			  $(window).resize(function(){
				  run()
			  });

		      if( left.css('position')=='fixed'  ){
				  $(window).resize(function(){
					  left.css({left:wrap.offset().left});
				  });
			  }else{
				  left.css({left:'0px'});
			  }

	  }

	  side_absolute($('.about_l'),$('.about_l').next(),$('#about_div'));

	  $(window).resize(function(){
		  side_absolute($('.about_l'),$('.about_l').next(),$('#about_div'));
	  });