$(function(){
var num = 0;
var gun = 0;
var clone1 = $('.demo1').clone(true);
$('.home').append(clone1[0]);
setInterval(function(){
num++;
if(num>4){
num = 1;
$('.home').css('top', 0);
}
gun = num*(-100);
$('.home').animate({'top': gun + '%'},500);
},30000)
})