.sliderwrapper{
position: relative; /*leave as is*/
overflow: hidden; /*leave as is*/
float: left;
width: 635px; /*width of featured content slider*/
height: 338px;
background-image: url('../images/loading.gif'); 
background-repeat: no-repeat;
background-position: center center;
}

.sliderwrapper .contentdiv{
visibility: hidden; /*leave as is*/
position: absolute; /*leave as is*/
left: 0;  /*leave as is*/
top: 0;  /*leave as is*/
filter:progid:DXImageTransform.Microsoft.alpha(opacity=100);
-moz-opacity: 1;
opacity: 1;
}