/* MULTIMEDIA */

/* RealAudio automatic rollover, just add <span class='btn_ra_topic_b'> */
.btn_ra_topic_b { 
background-image: url('http://www.pbs.org/newshour/science/images/common/btn_ra_topic_b_over.gif');
background-repeat: no-repeat; width: 42px; height: 10px; margin: 0 0 0 0; padding: 0; 
}
.btn_ra_topic_b a { width: 42px; height: 10px; margin: 0 0 0 0; }
.btn_ra_topic_b img {width: 42px; height: 10px; border: 0; margin: 0 0 0 0; } 
* html a:hover {visibility:visible; }
.btn_ra_topic_b a:hover img{visibility:hidden; margin: 0 0 0 0; }


/* MP3 automatic rollover, just add <span class='btn_mp3_topic_b'> */
.btn_mp3_topic_b { 
background-image: url('http://www.pbs.org/newshour/science/images/common/btn_mp3_topic_b_over.gif');
background-repeat: no-repeat; width: 41px; height: 10px; margin: 0 0 0 0; padding: 0; 
}
.btn_mp3_topic_b a { width: 41px; height: 10px; margin: 0 0 0 0; }
.btn_mp3_topic_b img {width: 41px; height: 10px; border: 0; margin: 0 0 0 0; }
* html a:hover {visibility:visible; }
.btn_mp3_topic_b a:hover img{visibility:hidden; margin: 0 0 0 0; }


/* Streaming Video automatic rollover, just add <span class='btn_video_topic_b'> */
.btn_video_topic_b { 
background-image: url('http://www.pbs.org/newshour/science/images/common/btn_video_topic_b_over.gif');
background-repeat: no-repeat; width: 72px; height: 10px; margin: 0 0 0 0; padding: 0; 
}
.btn_video_topic_b a { width: 72px; height: 10px; margin: 0 0 0 0; }
.btn_video_topic_b img {width: 72px; height: 10px; border: 0; margin: 0 0 0 0; }
* html a:hover {visibility:visible; }
.btn_video_topic_b a:hover img{visibility:hidden; margin: 0 0 0 0; }