Quick Help - I think I'm Overlooking Something!

#s3slider { 
   width: 840px; /* important to be same as image width */ 
   height: 250px; /* important to be same as image height */
   position: relative; /* important */
   overflow: hidden; /* important */
}
 
#s3sliderContent {
   width: 840px; /* important to be same as image width or wider */
   position: absolute; /* important */
   top: 0; /* important */
   margin-left: 0; /* important */
}
 
.s3sliderImage {
   float: left; /* important */
   position: relative; /* important */
   display: none; /* important */
}
 
.s3sliderImage span {
   position: absolute; /* important */
   left: 0;
   font: 16px Arial, Helvetica, sans-serif;
   padding: 10px 13px;
   width: 840px;
   background-color: #000;
   filter: alpha(opacity=70); /* here you can set the opacity of box with text */
   -moz-opacity: 0.7; /* here you can set the opacity of box with text */
   -khtml-opacity: 0.7; /* here you can set the opacity of box with text */
   opacity: 0.7; /* here you can set the opacity of box with text */
   color: #fff;
   display: none; /* important */
   bottom: 0;
 
   /*
       if you put
       top: 0; -> the box with text will be shown at the top of the image 
       if you put
       bottom: 0; -> the box with text will be shown at the bottom of the image
   */
}
 
.clear {
   clear: both;
}

<div id="s3slider">
   <ul id="s3sliderContent">
      <li class="s3sliderImage">
          <a href="#"><img src="http://www.karate-usa.com/slideshow/slide1.jpg" /></a>
          <span>This is test text.</span>
      </li>
      <li class="s3sliderImage">
          <a href="#"><img src="http://www.karate-usa.com/slideshow/slide2.jpg" /></a>
          <span>This is more test text.</span>
      </li>
      <div class="clear s3sliderImage"></div>
   </ul>
</div>