Buenas:
http://jsfiddle.net/grc4/wGRD7/
#imagecontainer {
background: url("http://3.bp.blogspot.com/_EqZzf-l7OCg/TNmdtcyGBZI/AAAAAAAAAD8/KD5Y23c24go/s1600/homer-simpson-1280x1024.jpg") no-repeat;
width: 450px;
height: 900px;
border: 1px solid;
background-size:contain;
}