.tickercontainer { /* the outer div with the black border */
background: #f58c01 url(../images/news-ticker-left.jpg) left no-repeat;
width: 831px; 
height: 30px; 
overflow: hidden;
float:left;
}
.tickercontainer .mask { /* that serves as a mask. so you get a sort of padding both left and right */
position: relative;
top: 5px;
width: 831px;
overflow: hidden;
}

ul.newsticker { /* that's your list */
position: relative;
left: 831px;
}
ul.newsticker li {
float: left; /* important: display inline gives incorrect results when you check for elem's width */
}
ul.newsticker a {
color: #fff;
margin: 0 50px 0 0;
} 
ul.newsticker span {
margin: 0 10px 0 0;
}

#news-ticker{
	width:920px;
	background:url(../images/news-ticker-title.jpg) no-repeat right;
	float:left;
}