Делаем спрайт (Sprite)

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<style type="text/css">
.class1, .class2
{
    width: 40px;
    height: 40px;
    background-image: url('pic.jpg');
    background-repeat: no-repeat;
}

.class1
{
    background-position: 0px 0px;
}

.class1:hover
{
    background-position: 0px -90px;
}

.class2
{
    background-position: -90px 0px;
}

.class2:hover
{
    background-position: -90px -90px;
}
</style>


<div class="class1"></div>
<div class="class2"></div>