$(window).scroll(function(){
    if($(window).scrollTop()>0){
     $("#headbox").addClass('header_hover');
    }else{
     $("#headbox").removeClass('header_hover');
    }
    });
function setTab(m,n){
    var tli=document.getElementById("menu"+m).getElementsByTagName("a");
    var mli=document.getElementById("main"+m).getElementsByTagName("ul");
    for(i=0;i<tli.length;i++){
     tli[i].className=i==n?"hover":"";
    mli[i].className=i==n?"block":"";
    }
   }
   function dongxiao(class_name,type) {
    var actual_h = $(class_name).outerHeight();
    var num1 = $(class_name).length;
    for(var m = 0; m < num1; m++) {
        var distance = $(class_name).eq(m).offset().top;
            $(class_name).eq(m).css({
                'animation-delay': (m / 6) + 's'
            }).addClass('animated '+type);
    };
}
dongxiao('.ban1','fadeInRight');
dongxiao('.banms','fadeInLeft');