//banner1 - 多图
function bb1(){
     var nav_num = '';
     var obj_li = $(".bb li");
     var count  = obj_li.length;
     obj_li.first().css("display","block");
     obj_li.each(function(){
         var index = $(this).index() + 1;
         nav_num += '<li><a href="javascript:void(0)">' + index + '</a></li>';
     });
    $(".banner").append('<ul class="num">' + nav_num + '</ul>');
    $(".num li").first().addclass("num_hover");
    $(".num li").hover(function(){
        sw = $(".num li").index(this);
        myshow(sw);
    });
    function myshow(i){
        $(".num li").eq(i).addclass("num_hover").siblings().removeclass("num_hover");
        obj_li.eq(i).stop(true,true).fadein(600).siblings("li").fadeout(600);
    }
    var mytime = 0;
    //滑入停止动画，滑出开始动画
    $(".bb").hover(function(){
        if(mytime){
           clearinterval(mytime);
        }
    },function(){
        mytime = setinterval(function(){
        myshow(sw);
        sw++;
        if(sw == count){
            sw=0;
        }
        } , 3000);
    });
    //自动开始
    var sw = 0;
    mytime = setinterval(function(){
       myshow(sw);
       sw++;
       if(sw == count){
           sw=0;
       }
    } , 2000);
}

//滚动
function scroll(){
    //产品滚动
    var speed = 30; //数字越大速度越慢
    var tab = document.getelementbyid("demo");
    var tab1 = document.getelementbyid("demo1");
    var tab2 = document.getelementbyid("demo2");
    var liwidth=tab1.getelementsbytagname("li");
    var liwidths=liwidth[0].offsetwidth;
    var length=$("#demo1 li").length;
    var mleft=parseint($("#demo1 li:eq(0)").css("marginleft"));
    var mright=parseint($("#demo1 li:eq(0)").css("marginright"));
    var totalwidth=(liwidths+mleft+mright)*length*2+300;
    $("#indemo").width(totalwidth);
    tab2.innerhtml = tab1.innerhtml;
    function marquee(){
        if(tab2.offsetwidth - tab.scrollleft <= 0)
            tab.scrollleft -= tab1.offsetwidth;
        else{
            tab.scrollleft++;
        }
    }
    var mymar = setinterval(marquee,speed);

    tab.onmouseover = function(){
        clearinterval(mymar);
    };
    tab.onmouseout = function(){
        mymar = setinterval(marquee,speed);
    };
}



//滚动
function scroll2(){
    //产品滚动
    var speed = 30; //数字越大速度越慢
    var tab = document.getelementbyid("m_demo");
    var tab1 = document.getelementbyid("m_demo1");
    var tab2 = document.getelementbyid("m_demo2");
    var liwidth=tab1.getelementsbytagname("li");
    var liwidths=liwidth[0].offsetwidth;
    var length=$("#m_demo1 li").length;
    var mleft=parseint($("#m_demo1 li:eq(0)").css("marginleft"));
    var mright=parseint($("#m_demo1 li:eq(0)").css("marginright"));
    tab2.innerhtml = tab1.innerhtml;
    var derection=1;
$(".l_btn").click(function(){
derection=1;
});
$(".r_btn").click(function(){
derection=0;
});
    function marquee(){
        if(derection){
        if(tab2.offsetwidth - tab.scrollleft <= 0)
            tab.scrollleft -= tab1.offsetwidth;
        else{
            tab.scrollleft++;
        }
    }else{
        if(tab.scrollleft <= 0)
            tab.scrollleft += tab1.offsetwidth;
        else{
            tab.scrollleft--;
        }
    }
    }
    var mymar = setinterval(marquee,speed);

    tab.onmouseover = function(){
        clearinterval(mymar);
    };
    tab.onmouseout = function(){
        mymar = setinterval(marquee,speed);
    };
}