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tedobedo каза:еми на картинката попринцип си имаш някакъв background нали?
Просто слагаш:
.clastfoqklas :hover { background: url('drkartinka.png') ; }
<div id="social">
<a href="http://www.facebook.com/"><img src="img/facebookgr.png" alt="" /></a>
</div>
#social {}
#social a { }
#social a:hover {background: url('../img/facebook.png') no-repeat; margin: 0 0 20px 0;}