.sm {
list-style:none;
width:680px;
height:150px;
display:block;
overflow:hidden;
margin:0;
padding:0;
}
.sm li {float:left; display:inline; overflow:hidden}

#spacer {
float:left;
width:150px;
height:150px;
background-image: url(images/mmainSpaces.png);
background-repeat:no-repeat;
margin:0;
padding:0;
}