Javascript error

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   I didn't see javascript forum, so I just ask my question here, if you don't mind.
I have been trying to figure out why I am having the following error:
top.body_frame.left_frame' is null or not an object
Please take a look at my code and tell me what I am doing wrong.
Thanks in advance
<script language="javascript" src="../mapserv.js"></script>
<script language="javascript1.2" src="../dynlayer.js"></script>
<script language="javascript1.2" src="../mouseevents.js"></script>
<script language="javascript1.2">
function init() {
 dragObject = new DynLayer("square");
 dragObject.dragActive = false;
 topObject = new DynLayer("top");
 leftObject = new DynLayer("left");
 bottomObject = new DynLayer("bottom");
 rightObject = new DynLayer("right");
 initMouseEvents();
 if (is.ie){
 document.all.square.style.top = "0px";
 }
 if (is.ns5){
 d = document.getElementById("square");
 d.style.top = 0;
 d.style.left = 0;
 }
}
</script>
<style type="text/css">
<!--
#square {position:absolute; left:0px; top:0px; width:80px; height:55px; clip:rect(0px 800px 550px 0px); visibility:hidden; background-color:blue; layer-background-color:blue;}
#top {position:absolute; left:0px; top:0px; width:150px; height:1px; font-size:1px; visibility:hidden; background-color:black; layer-background-color:black; z-index:200;}
#left {position:absolute; left:0px; top:0px; width:1px; height:150px; font-size:1px; visibility:hidden; background-color:black; layer-background-color:black; z-index:200;}
#bottom {position:absolute; left:0px; top:0px; width:150px; height:1px; font-size:1px; visibility:hidden; background-color:black; layer-background-color:black; z-index:200;}
#right {position:absolute; left:0px; top:0px; width:1px; height:150px; font-size:1px; visibility:hidden; background-color:black; layer-background-color:black; z-index:200;}
#map {position:absolute; left:0px; top:0px; visibility:visible; z-index:100;}
-->
</style>
</head>
<body OnLoad="init();setModetoLast();setReference();">
<div id="square"></div>
<div id="top"></div>
<div id="left"></div>
<div id="bottom"></div>
<div id="right"></div>
<form method="get" name="mapserv" action="/ms4.0/mapserv" target="_self" onSubmit='return setParams()'>
<!--# of layer input elements = # of layers + 1 -->
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="">
<input type="hidden" name="layer" value="counties">
<input type="hidden" name="qlayer" value="">
<input type="hidden" name="map_sparcel_class_expression" value="'#'">
<input type="hidden" name="mapsize" value="[mapsize]">
<input type="hidden" name="imgext" value="[mapext]">
<input type="hidden" name="mapext" value="">
<input type="hidden" name="imgxy" value="">
<input type="hidden" name="imgbox" value="">
<input type="hidden" name="reference" value=[ref]>
<input type="hidden" name="map" value=[map]>
<input type="hidden" name="zoomdir" value="[zoomdir]">
<input type="hidden" name="zoomsize" value="2">
<input type="hidden" name="mode" value="[mode]">
<input type="hidden" name="lastzoomdir" value="">
<input type="hidden" name="legend" value="[legend]">
<input type="hidden" name="template" value="map.html">
</form>
<div id="map"><img name="img" src="[img]" border="0"></div>
<script>
if ( navigator.appName == "Netscape") {
 var mapwidth = (window.innerWidth).toString();
 var mapheight = (window.innerHeight).toString();
}
else {
 var mapwidth = (top.body_frame.left_frame.document.body.clientWidth).toStri ng();
 var mapheight = (top.body_frame.left_frame.document.body.clientHeight).toStr ing();
}
document.mapserv.mapsize.value = mapwidth + " " + mapheight;
</script>
</body>
</html>