el botón atrás. funciona bien en mi pc pero no en otras.Transcrivo el código:
(barra de naveg con 5 bot creados en FW y export a DW,)
<script language="JavaScript" type="text/JavaScript">
<!--
function MM_reloadPage(init) { //reloads the window if Nav4 resized
if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);
//-->
//-->
function MM_preloadImages() { //v3.0
var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
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_nbGroup(event, grpName) { //v6.0
var i,img,nbArr,args=MM_nbGroup.arguments;
if (event == "init" && args.length > 2) {
if ((img = MM_findObj(args[2])) != null && !img.MM_init) {
img.MM_init = true; img.MM_up = args[3]; img.MM_dn = img.src;
if ((nbArr = document[grpName]) == null) nbArr = document[grpName] = new Array();
nbArr[nbArr.length] = img;
for (i=4; i < args.length-1; i+=2) if ((img = MM_findObj(args[i])) != null) {
if (!img.MM_up) img.MM_up = img.src;
img.src = img.MM_dn = args[i+1];
nbArr[nbArr.length] = img;
} }
} else if (event == "over") {
document.MM_nbOver = nbArr = new Array();
for (i=1; i < args.length-1; i+=3) if ((img = MM_findObj(args[i])) != null) {
if (!img.MM_up) img.MM_up = img.src;
img.src = (img.MM_dn && args[i+2]) ? args[i+2] : ((args[i+1])? args[i+1] : img.MM_up);
nbArr[nbArr.length] = img;
}
} else if (event == "out" ) {
for (i=0; i < document.MM_nbOver.length; i++) {
img = document.MM_nbOver[i]; img.src = (img.MM_dn) ? img.MM_dn : img.MM_up; }
} else if (event == "down") {
nbArr = document[grpName];
if (nbArr)
for (i=0; i < nbArr.length; i++) { img=nbArr[i]; img.src = img.MM_up; img.MM_dn = 0; }
document[grpName] = nbArr = new Array();
for (i=2; i < args.length-1; i+=2) if ((img = MM_findObj(args[i])) != null) {
if (!img.MM_up) img.MM_up = img.src;
img.src = img.MM_dn = (args[i+1])? args[i+1] : img.MM_up;
nbArr[nbArr.length] = img;
} }
}
function MM_callJS(jsStr) { //v2.0
return eval(jsStr)
}
//-->
function mmLoadMenus() {
if (window.mm_menu_0501065945_0) return;
window.mm_menu_0501065945_0 = new Menu("root",86,16,"Verdana, Arial, Helvetica, sans-serif",10,"#ffffff","#999999","#999999","#ffffff", "center","middle",3,0,1000,-5,7,true,true,false,0,true,true);
mm_menu_0501065945_0.addMenuItem("Alternativa  ;A","window.open('../Alternativa A.htm', 'mainFrame');");
mm_menu_0501065945_0.addMenuItem("Alternativa  ;B","window.open('../Alternativa B.htm', 'mainFrame');");
mm_menu_0501065945_0.addMenuItem("Alternativa  ;C","window.open('../Alternativa C.htm', 'mainFrame');");
mm_menu_0501065945_0.writeMenus();
} // mmLoadMenus()
//-->
</script>
<script language="JavaScript1.2" src="../imagenes/mm_menu.js"></script>
<script language="JavaScript1.2" src="mm_menu.js"></script>
</head>
<body bgcolor="#FFFFFF" background="../imagenes/FONDON.PNG" onLoad="MM_preloadImages('../imagenes/barrasec_r1_c2_f2.gif','../imagenes/barrasec_r1_c2_f4.gif','../imagenes/barrasec_r2_c2_f2.gif','../imagenes/barrasec_r2_c2_f4.gif','../imagenes/barrasec_r1_c2_f3.gif','../imagenes/barrasec_r2_c2_f3.gif','../imagenes/barrasec_r1_c8_f2.gif','../imagenes/barrasec_r1_c8_f4.gif','../imagenes/barrasec_r1_c8_f3.gif','../imagenes/barrasec_r2_c3_f2.gif','../imagenes/barrasec_r2_c3_f4.gif','../imagenes/barrasec_r2_c3_f3.gif','../imagenes/barrasec_r2_c6_f2.gif','../imagenes/barrasec_r2_c6_f4.gif','../imagenes/barrasec_r2_c6_f3.gif','../imagenes/barrasec_r2_c7_f2.gif','../imagenes/barrasec_r2_c7_f4.gif','../imagenes/barrasec_r2_c7_f3.gif');">
<div id="Layer1" style="position:absolute; width:678px; height:15px; z-index:1; left: 0px; top: 0px; background-color: #999999; layer-background-color: #999999; border: 1px none #000000;">
<div id="cuadradito" style="position:absolute; width:10px; height:12px; z-index:2; left: 0; top: 0;">
<p> </p>
</div>
<div id="BARRASEC" style="position:absolute; width:662px; height:17px; z-index:3; left: -2px; top: 0px;">
<script language="JavaScript1.2">mmLoadMenus();</script>
<table border="0" cellpadding="0" cellspacing="0" width="675">
<!-- fwtable fwsrc="barrasec.png" fwbase="barrasec.gif" fwstyle="Dreamweaver" fwdocid = "742308039" fwnested="0" -->
<tr>
<td><img src="../imagenes/spacer.gif" width="2" height="1" border="0" alt=""></td>
<td><img src="../imagenes/spacer.gif" width="133" height="1" border="0" alt=""></td>
<td><img src="../imagenes/spacer.gif" width="1" height="1" border="0" alt=""></td>alt=""></td>
</tr>
<tr>
<td rowspan="3"><img name="barrasec_r1_c1" src="../imagenes/barrasec_r1_c1.gif" width="2" height="17" border="0" alt=""></td>
<td colspan="2"><a href="../mapa.htm" target="mainFrame" onMouseOut="MM_nbGroup('out');" onMouseOver="MM_nbGroup('over','barrasec_r1_c2','. ./imagenes/barrasec_r1_c2_f2.gif','../imagenes/barrasec_r1_c2_f4.gif','barrasec_r2_c2','../imagenes/barrasec_r2_c2_f2.gif','../imagenes/barrasec_r2_c2_f4.gif',1);" onClick="MM_nbGroup('down','navbar1','barrasec_r1_ c2','../imagenes/barrasec_r1_c2_f3.gif','barrasec_r2_c2','../imagenes/barrasec_r2_c2_f3.gif',1);"><img name="barrasec_r1_c2" src="../imagenes/barrasec_r1_c2.gif" width="134" height="1" border="0" alt=""></a></td>
<td colspan="4"><img name="barrasec_r1_c4" src="../imagenes/barrasec_r1_c4.gif" width="405" height="1" border="0" alt=""></td>
<td rowspan="2"><a href="javascript
:;" target="_top" onMouseOut="MM_nbGroup('out');" onMouseOver="MM_nbGroup('over','barrasec_r1_c8','. ./imagenes/barrasec_r1_c8_f2.gif','../imagenes/barrasec_r1_c8_f4.gif',1);" onClick="MM_nbGroup('down','navbar1','barrasec_r1_ c8','../imagenes/barrasec_r1_c8_f3.gif',1);"></a><a href="javascript
:window.print();"><span class=""><img name="barrasec_r1_c8" src="../imagenes/barrasec_r1_c8.gif" width="134" height="16" border="0" alt=""></a></td>
<td><img src="../imagenes/spacer.gif" width="1" height="1" border="0" alt=""></td>
</tr>
<tr>
<td><a href="../mapa.htm" target="mainFrame" onMouseOut="MM_nbGroup('out');" onMouseOver="MM_nbGroup('over','barrasec_r1_c2','. ./imagenes/barrasec_r1_c2_f2.gif','../imagenes/barrasec_r1_c2_f4.gif','barrasec_r2_c2','../imagenes/barrasec_r2_c2_f2.gif','../imagenes/barrasec_r2_c2_f4.gif',1);" onClick="MM_nbGroup('down','navbar1','barrasec_r1_ c2','../imagenes/barrasec_r1_c2_f3.gif','barrasec_r2_c2','../imagenes/barrasec_r2_c2_f3.gif',1);"><img name="barrasec_r2_c2" src="../imagenes/barrasec_r2_c2.gif" width="133" height="15" border="0" alt=""></a></td>
<td rowspan="2" colspan="2"><a href="javascript
:;" target="_top" onMouseOut="MM_nbGroup('out');MM_startTimeout();" onMouseOver="MM_showMenu(window.mm_menu_0501065945 _0,0,17,null,'barrasec_r2_c3');MM_nbGroup('over',' barrasec_r2_c3','../imagenes/barrasec_r2_c3_f2.gif','../imagenes/barrasec_r2_c3_f4.gif',1);" onClick="MM_nbGroup('down','navbar1','barrasec_r2_ c3','../imagenes/barrasec_r2_c3_f3.gif',1);"><img name="barrasec_r2_c3" src="../imagenes/barrasec_r2_c3.gif" width="134" height="16" border="0" alt=""></a></td>
<td rowspan="2"><img name="barrasec_r2_c5" src="../imagenes/barrasec_r2_c5.gif" width="2" height="16" border="0" alt=""></td>
<td rowspan="2"><a href="bot%F3nA.htm" target="mainFrame" onMouseOut="MM_nbGroup('out');" onMouseOver="MM_nbGroup('over','barrasec_r2_c6','. ./imagenes/barrasec_r2_c6_f2.gif','../imagenes/barrasec_r2_c6_f4.gif',1);" onClick="MM_nbGroup('down','navbar1','barrasec_r2_ c6','../imagenes/barrasec_r2_c6_f3.gif',1);"><img name="barrasec_r2_c6" src="../imagenes/barrasec_r2_c6.gif" width="134" height="16" border="0" alt=""></a></td>
<td rowspan="2"><a href="javascript
:;" target="mainFrame" onMouseOut="MM_nbGroup('out');" onMouseOver="MM_nbGroup('over','barrasec_r2_c7','. ./imagenes/barrasec_r2_c7_f2.gif','../imagenes/barrasec_r2_c7_f4.gif',1);" onClick="MM_nbGroup('down','navbar1','barrasec_r2_ c7','../imagenes/barrasec_r2_c7_f3.gif',1);"><img name="barrasec_r2_c7" src="../imagenes/barrasec_r2_c7.gif" width="136" height="16" border="0" alt=""onClick="history.back()"></a></td>
<td><img src="../imagenes/spacer.gif" width="1" height="15" border="0" alt=""></td>
</tr>
<tr>
<td><img name="barrasec_r3_c2" src="../imagenes/barrasec_r3_c2.gif" width="133" height="1" border="0" alt=""></td>
<td><img name="barrasec_r3_c8" src="../imagenes/barrasec_r3_c8.gif" width="134" height="1" border="0" alt=""></td>
<td><img src="../imagenes/spacer.gif" width="1" height="1" border="0" alt=""></td>
</tr>
</table>
</div>
</div>
</div>
</body>
</html>