<div class="img-desc">     
     <img src="sample.jpg" alt="" />     
     <cite>Симпатичный диванчик. Устраивайтесь по-удобнее... </cite>     
     </div>

.img-desc {     
position: relative;     
display: block;     
height:335px;     
width: 575px;     
}     
.img-desc cite {     
background: #111;     
filter:alpha(opacity=55);     
opacity:.55;     
color: #fff;     
position: absolute;     
bottombottom: 0;     
leftleft: 0;     
width: 555px;     
padding: 10px;     
border-top: 1px solid #999;     
}