Probleem script in FireFox (Opgelost)

<SCRIPT LANGUAGE="JavaScript">
<!-- Original: Gregor (legreg@legreg.de) -->

<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

<!-- Begin
var ie4 = (document.all) ? true : false;

var ns4 = (document.layers) ? true : false;

var ns6 = (document.getElementById && !document.all) ? true : false;

function hidelayer(lay) {
if (ie4) {document.all[lay].style.visibility = "hidden";}

if (ns4) {document.layers[lay].visibility = "hide";}

if (ns6) {document.getElementById([lay]).style.display = "none";}

}
function showlayer(lay) {
if (ie4) {document.all[lay].style.visibility = "visible";}

if (ns4) {document.layers[lay].visibility = "show";}

if (ns6) {document.getElementById([lay]).style.display = "block";}

}
function writetolayer(lay,txt) {
if (ie4) {

document.all[lay].innerHTML = txt;
}
if (ns4) {

document[lay].document.write(txt);
document[lay].document.close();

}
if (ns6) {
over = document.getElementById([lay]);

range = document.createRange();
range.setStartBefore(over);

domfrag = range.createContextualFragment(txt);
while (over.hasChildNodes()) {

over.removeChild(over.lastChild);
}
over.appendChild(domfrag);

}
}
// End -->
</script>

<div id="newlayer" style="whatever...">je tekst hier</div>

<a href="#" onclick="javascript:hidelayer('newlayer');" >hide</a><br />
<a href="#" onclick="javascript:showlayer('newlayer');" >show</a>

<SCRIPT LANGUAGE="JavaScript">
<!-- Original: Gregor (legreg@legreg.de) -->
 
<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->
 
<!-- Begin
var ie4 = (document.all) ? true : false;
 
var ns4 = (document.layers) ? true : false;
 
var ns6 = (document.getElementById && !document.all) ? true : false;
 
function hidelayer(lay) {
if (ie4) {document.all[lay].style.visibility = "hidden";}
 
if (ns4) {document.layers[lay].visibility = "hide";}
 
if (ns6) {document.getElementById([lay]).style.display = "none";}
 
}
function showlayer(lay) {
if (ie4) {document.all[lay].style.visibility = "visible";}
 
if (ns4) {document.layers[lay].visibility = "show";}
 
if (ns6) {document.getElementById([lay]).style.display = "block";}
 
}
function writetolayer(lay,txt) {
if (ie4) {
 
document.all[lay].innerHTML = txt;
}
if (ns4) {
 
document[lay].document.write(txt);
document[lay].document.close();
 
}
if (ns6) {
over = document.getElementById([lay]);
 
range = document.createRange();
range.setStartBefore(over);
 
domfrag = range.createContextualFragment(txt);
while (over.hasChildNodes()) {
 
over.removeChild(over.lastChild);
}
over.appendChild(domfrag);
 
}
}
// End -->
</script>
 
<div id="newlayer" style="whatever...">je tekst hier</div>
 
<a href="#" onclick="javascript:hidelayer('newlayer');" >hide</a><br />
<a href="#" onclick="javascript:showlayer('newlayer');" >show</a>