.sliderwrapper{
position: relative; /*leave as is*/
overflow: hidden; /*leave as is*/
width: 600px; /*width of featured content slider*/
height: 60px;
}

.sliderwrapper .contentdiv{
visibility: hidden; /*leave as is*/
position: absolute; /*leave as is*/
left: 0;  /*leave as is*/
top: 0;  /*leave as is*/
width: 580px; /*width of content DIVs within slider. Total width should equal slider's inner width (390+5+5=400) */
height: 100%;
}