javascript treeview does not work in netscape

[carrera]

A friend of mine gave a code using javascript in creating a treemenu.I wanted it to be dynamic so I used ASP and access as dbase. It works in IE but not in Netscape. Can you help me with it? thanks.
<%
Dim rsCat, j, k, rsSub, sqlX
Set rsCat = Server.CreateObject("ADODB.REcordset")
sqlX = "Select * from tbCateg order by Categ asc"
rsCat.Open sqlX, connect
j = 1 'Level1
k = 0 'id=OUTOs, OUT1s, OUT2s / OUTOt, OUT1t, OUT2t increment by 1
%>
<%While not rsCat.eof%>
&nbsp;<a class=Level<%=j%> id=OUT<%=k%>t> <img class=LEVEL1 id=OUT<%=k%>i src="images/plus.gif" border=0>&nbsp;<font face="Arial, Helvetica, sans-serif" size="2" color="#0033CC"><%=rsCat("Categ")%></font></a><br>

<div id=OUT<%=k%>s style="DISPLAY: none">
<%Set rsSub = Server.CreateObject("ADODB.Recordset")
sqlX = "Select * from tbSubCat where CategID=" & rsCat("CategID") & " order by SubCat asc"
rsSub.Open sqlX, connect
If not rsSub.eof then
While not rsSub.eof
%>
&nbsp;<img src="images/none.gif" border="0">&nbsp;<font face="Arial, Helvetica, sans-serif" size="1" color="#6699FF"><%=rsSub("SubCat")%></font><br>

<%
rsSub.movenext
Wend
End if%><br>
</div>

<% k = k + 1

rsCat.movenext
Wend

rsCat.close
set rsCat = nothing
rsSub.close
set rsSub = nothing
%>


<script language=JavaScript>
var img1 = new Image();
img1.src = "images/plus.gif";
var img2 = new Image();
img2.src = "images/minus.gif";

function doOutline() {
var srcId, srcElement, targetElement;
srcElement = window.event.srcElement;
if (srcElement.className.toUpperCase() == "LEVEL1" || srcElement.className.toUpperCase() == "FAQ") {
srcID = srcElement.id.substr(0, srcElement.id.length-1);
targetElement = document.all(srcID + "s");
srcElement = document.all(srcID + "i");

if (targetElement.style.display == "none") {
targetElement.style.display = "";
if (srcElement.className == "LEVEL1") srcElement.src = img2.src;
} else {
targetElement.style.display = "none";
if (srcElement.className == "LEVEL1") srcElement.src = img1.src;
}
}
}

document.onclick = doOutline;

</script>