#principal {
  position: absolute; left: 50%; top: 50%;
  width: 770px; height: 350px;
  margin-left: -385px; margin-top: -175px;
}
#fondo {
  position: absolute; left: 0px; top: 0px;
  background-color: #fff; z-index: 0;
  visibility: show;
}

#banda-sup { position: absolute; left: 0px; top:   0px; z-index: 1; }
#banda-mid { position: absolute; left: 0px; top:  80px; z-index: 1; }
#banda-inf { position: absolute; left: 0px; top: 179px; z-index: 1; }

#lin-w { position: absolute; left: 0px; top: 179px; z-index: 2; }
#lin-k { position: absolute; left: 0px; top: 328px; z-index: 2; }

#logo  { position: absolute; left:  12px; top:  30px; z-index: 3; }
#orto  { position: absolute; left: 388px; top:  83px; z-index: 3; }
#silla { position: absolute; left: 545px; top: 106px; z-index: 3; }

#link1 { position: absolute; left:   0px; top: 180px; z-index: 3; }
#link2 { position: absolute; left: 113px; top: 180px; z-index: 3; }
#link3 { position: absolute; left: 226px; top: 180px; z-index: 3; }
#link4 { position: absolute; left: 339px; top: 180px; z-index: 3; }

.btn { position: absolute; left: 0px; top:  0px; }
.fot { position: absolute; left: 0px; top: 16px; }
.sep { position: absolute; left: 105px; top: 0px; }

#copy { position: relative; float: left; clear: left; }
#mail { position: relative; float: right; clear: right; }

#copy, #mail {
  margin-top: -1.5em; padding: 0;
  font-family: Tahoma, Arial, Helvetica, sans-serif;
  font-size: 9pt;
}