<a href="http://www.facebook.com/" target="_blank" class="social-facebook"></a>
<a href="http://twitter.com/" target="_blank" class="social-twitter"></a>
<a href="http://vk.com/" target="_blank" class="social-vk"></a>
<a href="http://www.yandex.ru/" target="_blank" class="social-ya"></a>
<a href="http://www.youtube.com/" target="_blank" class="social-youtube"></a>

.social-facebook {display:inline-block;width:60px;height:60px;background:url('http://ext1on.my1.ru/_file/icon/1.png') no-repeat;}
.social-twitter {display:inline-block;width:60px;height:60px;background:url('http://ext1on.my1.ru/_file/icon/1.png') 0 -60px no-repeat;}
.social-vk {display:inline-block;width:60px;height:60px;background:url('http://ext1on.my1.ru/_file/icon/1.png') 0 -120px no-repeat;}
.social-ya {display:inline-block;width:60px;height:60px;background:url('http://ext1on.my1.ru/_file/icon/1.png') 0 -180px no-repeat;}
.social-youtube {display:inline-block;width:60px;height:60px;background:url('http://ext1on.my1.ru/_file/icon/1.png') 0 -240px no-repeat;}
.social-facebook:hover {background-position:-60px 0;}
.social-twitter:hover {background-position:-60px -60px;}
.social-vk:hover {background-position:-60px -120px;}
.social-ya:hover {background-position:-60px -180px;}
.social-youtube:hover {background-position:-60px -240px;}