me sigue sin funcionar, te paso el codigo:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Documento sin título</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css">
a:link {
text-decoration:none;
font-family: Garamond, "Times New Roman";
font-size: 14px;
color: #FFFFCC;
font-weight: bold;
white-space: normal;
}
a:visited {
text-decoration:none;
font-family: Garamond, "Times New Roman";
font-size: 14px;
color: #FFFFCC;
font-weight: bold;
}
a:hover{
text-decoration:none;
font-family: Garamond, "Times New Roman";
font-size: 14px;
color: #FFCC99;
font-weight: bold;
font-style:italic;
}
a:active{
text-decoration:none;
font-family: Garamond, "Times New Roman";
font-size: 14px;
font-weight: bold;
color: #FFFFCC;
}
a.enlace span { padding: 0 30px; }
a.enlace:hover { background: url(../imagenes/flecha_anterior.gif)) no-repeat left center; }
a.enlace:hover span { background: url(../imagenes/flecha_anterior.gif)) no-repeat right center; }
</style>
<script language="JavaScript" type="text/JavaScript">
<!--
function MM_findObj(n, d) { //v4.01
var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_showHideLayers() { //v6.0
var i,p,v,obj,args=MM_showHideLayers.arguments;
for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }
obj.visibility=v; }
}
//-->
</script>
</head>
<body background="../imagenes/Barra.png">
<div id="Layer1" style="position:absolute; left:297px; top:14px; width:147px; height:28px; z-index:1"><a href="celtiberos/index.html" target="_parent" class="enlace"><span>LOS
CELTÍBEROS</span></a></div>
<div id="Layer5" style="position:absolute; left:6px; top:4px; width:112px; height:61px; z-index:5">
<img src="http://www.forosdelweb.com/f53/imagenes/transparente%20copia.gif" width="121" height="56">
</div>
<div id="Layer2" style="position:absolute; left:476px; top:14px; width:206px; height:28px; z-index:2"><a href="sitios_arqueol%F3gicos/index.html" target="_parent">SITIOS
ARQUEOLÓGICOS</a></div>
<div id="Layer3" style="position:absolute; left:731px; top:14px; width:84px; height:28px; z-index:3"><a href="museos/index.html" target="_parent">MUSEOS</a></div>
<div id="Layer4" style="position:absolute; left:861px; top:14px; width:95px; height:28px; z-index:4"><a href="eventos/index.html" target="_parent">EVENTOS</a></div>
</body>
</html>