body {
  margin: 0;
  border: 0;
  padding: 0;
  background: #b41e00 url(graphics/bkg.gif) repeat-x;
  overflow: hidden;
  font: 16px "Trebuchet MS",Arial,Helvetica,sans-serif;
  font-weight: bold;
  text-align:center; 
  }
  
ul {
	margin:0;
	padding:0;
  list-style:none;
  }
  
img {
  border:0;
  }  
  
#tabs {
  position: relative;
  top: 170px;
  text-align: center;
  width:720px;
  margin: 0 auto;
  line-height:normal;
  z-index: 40;
  }

#tabs li {
  display:inline;
  margin:0;
  padding:0;
  }

#tabs a {
  float:left;
  background:url("graphics/tableft.gif") no-repeat left top;
  margin:0;
  padding:0 0 0 4px;
  text-decoration:none;
  }

#tabs a span {
  float:left;
  display:block;
  background:url("graphics/tabright.gif") no-repeat right top;
  padding:5px 15px 4px 6px;
  color:#800f00;
  }

#tabs a:hover span {
  color:#ffeeee;
  }

#tabs a:hover {
  background-position:0% -42px;
  }

#tabs a:hover span {
  background-position:100% -42px;
  }

img#caduceo { 
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 0; 
  }  

img#atomo {
  position: absolute;
  top: 65px;
  left: 715px;
  z-index: 10; 
  }  

#right {
  float:right;
  font-size:93%;
  line-height:normal;
  }

a.button {
  display: block;
  width: 86px;
  height: 24px;
  margin: 3px;
  text-decoration: none;
  text-align: center;
  font: 12px/24px "Trebuchet MS",Arial,sans-serif;
  background: url(graphics/bkgbtn.gif);color: #eeeaea;
  }

a.button:hover {
  background-position:0 -24px;
  color: #800f00;
  }