a.arka1{width: 140px; height: 106px; background: url(arka1.jpg) no-repeat; border:0px; display:block}
a.arka1:hover{ background: url(arka2.jpg) no-repeat; }
a.arka1 img { margin:2px; border:0px;}

<a class="arka1" href="#bcn"><img src="1.jpg" alt=""/></a>