function refresh() { var s = $(".box1"); if (!s.is(":animated")) $(".box1").animate({ marginLeft: "0px" }, "slow", function () { $('.box1 img:first').before($('.box1 img:last')); $(".box1").css("margin-left", "-206px"); }); } <div class="frame"><div class="box1"><img src="img/001.png" alt="" /><img src="img/002.png" alt="" /><img src="img/003.png" alt="" /><img src="img/004.png" alt="" /></div></div> <button type="button"><<</button><button type="button" onclick="refresh()">>></button> .box1 { width:1200px; overflow:hidden; margin-left:-206px; } .frame { width:620px; overflow:hidden; }