navigation script uncompatable

the following script is for a dropdown navigation tree, is it possible to make it compatable with all browsers?

[code] menu.js
<!–
var ns6 = document.getElementById && !document.all ? 1 : 0
var folder = ”

function expand(curobj) {
folder = ns6 ? curobj.nextSibling.nextSibling.style : document.all[curobj.sourceIndex + 1].style

if (folder.display == “none”)
folder.display = “”
else
folder.display = “none”

return 0
}

function doNothing() {
return
}
//–>
[/code]

[code] html file
<a href=”javascript:doNothing()” onclick=”javascript:expand(this)” class=”header”>Example Header1</a>
<div style=”display: none;”>
<a href=”info.php” class=”link”>Example Link</a><br />
<a href=”info.php” class=”link”>Example Link</a><br />
<a href=”info.php” class=”link”>Example Link</a><br />
<a href=”info.php” class=”link”>Example Link</a><br />
</div>
[/code]

any help is greatly appreciated

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