.img-1{
background: url("images/apple_1_bigger.jpg");
border: 2px solid black;
}
.img-2{
background: url("images/apple_2_bigger.jpg");
border: 2px solid black;
}
img src="images/apple_1.jpg" class="img1" title="apple_1"
img src="images/apple_2.jpg" class="img2" title="苹果iPod"
</div>
<div id="bot" style="position: absolute">
/div
/div