Navigateur et menu vertical

bonjour j ai trouve un  petit script sur Internet (merci au createur) qui affiche un lien pour un menu deroulant vertical en haut de ma page. Normalement ce lien est suppose rester en haut de la page meme lorsque l on descend dans la page masi cela ne marche pas avec tt les versions d IE.
Mai mon plus gros probleme est que le menu ne s affiche pas du tout avec Mozilla. Impossible d ouvrir le meu en clickant sur l'image. Si quelqu un pouvez m aider. Suis une grande debutante en java script et ne sait pas du tout pourquoi

merci beaucoup

voici le script

<style type="text/css">
<!--

#master  {position:absolute; width: 200px; top: 10px; left: -150px; z-index:2; visibility:visible;}
#menu   {position:absolute; width: 18px; top: 0px; left: 150px; z-index:5; visibility:visible;}
#top   {position:absolute; width: 150px; top: 0px; left: 0px; z-index:5; visibility:visible;}
#screen  {position:absolute; width: 150px; top: 6px; left: 0px; z-index:5; visibility:visible;}
#screenlinks {position:absolute; width: 150px; top: 6px; left: 0px; z-index:5; visibility:visible;}

-->
</style>
<style type="text/css">
<!--

.NavJump {font-family: arial; font-size: 12pt; color: #015B92; text-decoration: none;}
a:link.NavJump {color : #015B92;}
a:visited.NavJump {color : #015B92;}
a:active.NavJump {text-decoration: none; color: #D2EEFF;}
a:hover.NavJump {text-decoration: none; color: #D2EEFF;}

-->
</style>
<script language = "javascript">
<!--

var ie = document.all ? 1 : 0
var ns = document.layers ? 1 : 0

if(ie){
document.write('<style type="text/css">')
document.write("#screen {filter:Alpha(Opacity=30);}")
document.write("</style>")
}

if(ns){
document.write('<style type="text/css">')
document.write("#master {clip:rect(0,150,250,0);}")
document.write("</style>")
}

//-->
</script>
<script language = "javascript">
<!--

var ie = document.all ? 1 : 0
var ns = document.layers ? 1 : 0

var master = new Object("element")
master.curLeft = -150; master.curTop = 10;
master.gapLeft = 0;  master.gapTop = 0;
master.timer = null;

function moveAlong(layerName, paceLeft, paceTop, fromLeft, fromTop){
clearTimeout(eval(layerName).timer)

if(eval(layerName).curLeft != fromLeft){
     if((Math.max(eval(layerName).curLeft, fromLeft) - Math.min(eval(layerName).curLeft, fromLeft)) < paceLeft){eval(layerName).curLeft = fromLeft}
else if(eval(layerName).curLeft < fromLeft){eval(layerName).curLeft = eval(layerName).curLeft + paceLeft}
else if(eval(layerName).curLeft > fromLeft){eval(layerName).curLeft = eval(layerName).curLeft - paceLeft}
if(ie){document.all[layerName].style.left = eval(layerName).curLeft}
if(ns){document[layerName].left = eval(layerName).curLeft}
}

if(eval(layerName).curTop != fromTop){
     if((Math.max(eval(layerName).curTop, fromTop) - Math.min(eval(layerName).curTop, fromTop)) < paceTop){eval(layerName).curTop = fromTop}
else if(eval(layerName).curTop < fromTop){eval(layerName).curTop = eval(layerName).curTop + paceTop}
else if(eval(layerName).curTop > fromTop){eval(layerName).curTop = eval(layerName).curTop - paceTop}
if(ie){document.all[layerName].style.top = eval(layerName).curTop}
if(ns){document[layerName].top = eval(layerName).curTop}
}

eval(layerName).timer=setTimeout('moveAlong("'+layerName+'",'+paceLeft+','+paceTop+','+fromLeft+','+fromTop+')',30)
}

function setPace(layerName, fromLeft, fromTop, motionSpeed){
eval(layerName).gapLeft = (Math.max(eval(layerName).curLeft, fromLeft) - Math.min(eval(layerName).curLeft, fromLeft))/motionSpeed
eval(layerName).gapTop = (Math.max(eval(layerName).curTop, fromTop) - Math.min(eval(layerName).curTop, fromTop))/motionSpeed

moveAlong(layerName, eval(layerName).gapLeft, eval(layerName).gapTop, fromLeft, fromTop)
}

var expandState = 0

function expand(){
if(expandState == 0){setPace("master", 0, 10, 10); if(ie){document.menutop.src = "menub.gif"}; expandState = 1;}
else{setPace("master", -150, 10, 10); if(ie){document.menutop.src = "menu.gif"}; expandState = 0;}
}

//-->
</script>

<div id="master">

<div id="menu">
<table border="0" width="18" cellspacing="0" cellpadding="0">
<tr><td width="100%"><a href="javascript:expand()" onfocus="this.blur()"><img name="menutop" border="0" src="menu.gif" width="22" height="90"></a></td></tr>
</table>
</div>

<div id="top">
<table border="0" width="150" cellspacing="0" cellpadding="0">
<tr><td width="100%"><img border="0" src="top.gif" width="150" height="6"></td></tr>
</table>

</div>

<div id="screen">
<table border="0" width="150" cellspacing="0" cellpadding="5">
<tr><td width="100%" bgcolor="#015B92">

<table border="0" width="100%" bgcolor="#015B92" cellspacing="0" cellpadding="0">
<tr><td width="100%">

<table border="0" width="100%" cellspacing="1" cellpadding="5">
<tr><td width="100%" bgcolor="#FFFFFF">

<font class="NavJump"><br></font><font class="NavJump"><br></font><font class="NavJump"><br></font><font class="NavJump"><br></font><font class="NavJump"><br></font><font class="NavJump"><br></font><font class="NavJump"><br></font><font class="NavJump"><br></font><font class="NavJump"><br></font>

</td></tr>
</table>

</td></tr>
</table>

</td></tr>
</table>
</div>

<div id="screenlinks">
<table border="0" width="150" cellspacing="0" cellpadding="5">
<tr><td width="100%">

<table border="0" width="100%" bgcolor="#015B92" cellspacing="0" cellpadding="0">
<tr><td width="100%">

<table border="0" width="100%" cellspacing="1" cellpadding="5">
<tr><td width="100%" bgcolor="#FFFFFF">

<a href="../index.htm" class="NavJump" target="_parent"><b>- Presentation</b></a><br>
<a href="../index.htm#Objective" class="NavJump" target="_parent"><b>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Objective</b></a><br>
<a href="../index.htm#Prerequite" class="NavJump" target="_parent"><b>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Prerequisite</b></a><br>

<a href="indexTheorist.htm#LSOrigin" class="NavJump" ><b>- LS Origin</b></a><br>
<a href="indexTheorist.htm#LSModels" class="NavJump" ><b>- LS Models</b></a><br>
<a href="indexTheorist.htm#mainModels" class="NavJump"><b>- Main models</b></a><br>
<a href="indexTheorist.htm#Kolb" class="NavJump"><b>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Kolb's model</b></a><br>
<a href="indexTheorist.htm#HM" class="NavJump"><b>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;H&M's model</b></a><br>
<a href="indexTheorist.htm#exemples" class="NavJump"><b>- Examples</b></a><br>

<a href="Evaluation.php" class="NavJump" target="_parent"><b> - Evaluation</b></a><br>
<a href="FReading.htm" class="NavJump" target="_parent"><b>- Further Read</b></a><br>

</td></tr>
</table>

</td></tr>
</table>

</td></tr>
</table>
</div>

</div>

<script language = "javascript">
<!--

if(ie){var sidemenu = document.all.master;}
if(ns){var sidemenu = document.master;}

function FixY(){
if(ie){sidemenu.style.top = document.body.scrollTop+10}
if(ns){sidemenu.top = window.pageYOffset+10}
}

setInterval("FixY()",100);

//-->
</script>