.tickercontainer { /* the outer div with the black border */
position: relative; background: url(../images/structure/np-bg.png) repeat-x; float: left; height: 22px; width: 658px; overflow: hidden;
}
.tickercontainer .mask { /* that serves as a mask. so you get a sort of padding both left and right */
position: relative;
left: 10px;
top: 0;
width: 658px;
overflow: hidden;
}
ul.newsticker { /* that's your list */
position: relative;
left: 750px;
font:  normal 11px Tahoma;
list-style-type: none;
margin: 0;
padding: 0;
}
ul.newsticker li {
float: left; /* important: display inline gives incorrect results when you check for elem's width */
margin-right: 15px;
padding: 0;
color: #414141;    
}