Menu rectractable flottant - Besoin d'aide !!

Bonjour,
Je suis novice dans la création de site web. Je souhaite mettre un menu retractable flottant (qui suit le scroll de la page). J'ai trouvé sur un site le script. La seule chose qui bloque est qu'il n'est pas flottant et qu'il reste en haut de la page.
Pourriez m'aider en me disant ce qu'il faut modifier ou ajouter pour qu'il le devienne.
Voici le script :

NS6 = (document.getElementById&&!document.all)
IE = (document.all)
NS = (navigator.appName=="Netscape" && navigator.appVersion.charAt(0)=="4")

tempBar='';barBuilt=0;ssmItems=new Array();


moving=setTimeout('null',1)
function moveOut() {
if ((NS6||NS)&&parseInt(ssm.left)<0 || IE && ssm.pixelLeft<0) {
clearTimeout(moving);moving = setTimeout('moveOut()', slideSpeed);slideMenu(10)}
else {clearTimeout(moving);moving=setTimeout('null',1)}};
function moveBack() {clearTimeout(moving);moving = setTimeout('moveBack1()', waitTime)}
function moveBack1() {
if ((NS6||NS) && parseInt(ssm.left)>(-menuWidth) || IE && ssm.pixelLeft>(-menuWidth)) {
clearTimeout(moving);moving = setTimeout('moveBack1()', slideSpeed);slideMenu(-10)}
else {clearTimeout(moving);moving=setTimeout('null',1)}}
function slideMenu(num){
if (IE) {ssm.pixelLeft += num;}
if (NS||NS6) {ssm.left = parseInt(ssm.left)+num;}
if (NS) {bssm.clip.right+=num;bssm2.clip.right+=num;}}

function makeStatic() {
if (NS||NS6) {winY = window.pageYOffset;}
if (IE) {winY = document.body.scrolltop;}
if (NS6||IE||NS) {
if (winY!=lastY&&winY>YOffset-staticYOffset) {
smooth = .2 * (winY - lastY - YOffset + staticYOffset);}
else if (YOffset-staticYOffset+lastY>YOffset-staticYOffset) {
smooth = .2 * (winY - lastY - (YOffset-(YOffset-winY)));}
else {smooth=0}
if(smooth > 0) smooth = Math.ceil(smooth);
else smooth = Math.floor(smooth);
if (IE) bssm.pixelTop+=smooth;
if (NS6||NS) bssm.top=parseInt(bssm.top)+smooth
lastY = lastY+smooth;
setTimeout('makeStatic()', 1)}}

function buildBar() {
if(barText.indexOf('<IMG')>-1) {tempBar=barText}
else{for (b=0;b<barText.length;b++) {tempBar+=barText.charAt(b)+"<BR>"}}
document.write('<td align="center" rowspan="100" width="'+barWidth+'" bgcolor="'+barBGColor+'" valign="'+barVAlign+'"><p align="center"><font face="'+barFontFamily+'" Size="'+barFontSize+'" COLOR="'+barFontColor+'"><B>'+tempBar+'</B></font></p></TD>')}

function initSlide() {
if (NS6){
ssm=document.getElementById("thessm").style;
bssm=document.getElementById("basessm").style;
bssm.clip="rect(0 "+document.getElementById("thessm").offsetWidth+" "+document.getElementById("thessm").offsetHeight+" 0)";ssm.visibility="visible";
}else if (IE) {
ssm=document.all("thessm").style;
bssm=document.all("basessm").style;
bssm.clip="rect(0 "+thessm.offsetWidth+" "+thessm.offsetHeight+" 0)";bssm.visibility = "visible";
}else if (NS) {
bssm=document.layers["basessm1"];
bssm2=bssm.document.layers["basessm2"];ssm=bssm2.document.layers["thessm"];
bssm2.clip.left=0;ssm.visibility = "show";
}
if (menuIsStatic=="yes")
makeStatic();
}

function buildMenu() {
if (IE||NS6) {
document.write('<DIV ID="basessm" style="visibility:hidden;Position : Absolute ;Left : '+XOffset+' ;Top : '+YOffset+' ;Z-Index : 20;width:'+(menuWidth+barWidth+10)+'"><DIV ID="thessm" style="Position : Absolute ;Left : '+(-menuWidth)+' ;Top : 0 ;Z-Index : 20;" onmouseover="moveOut()" onmouseout="moveBack()">');
}
if (NS) {
document.write('<LAYER name="basessm1" top="'+YOffset+'" LEFT='+XOffset+' visibility="show"><ILAYER name="basessm2"><LAYER visibility="hide" name="thessm" bgcolor="'+menuBGColor+'" left="'+(-menuWidth)+'" onmouseover="moveOut()" onmouseout="moveBack()">');
}
if (NS6){
document.write('<table border="0" cellpadding="0" cellspacing="0" width="'+(menuWidth+barWidth+2)+'" bgcolor="'+menuBGColor+'"><TR><TD>');
}
document.write('<table border="0" cellpadding="0" cellspacing="1" width="'+(menuWidth+barWidth+2)+'" bgcolor="'+menuBGColor+'">');
for(i=0;i<ssmItems.length;i++) {
if(!ssmItems[i][3]){
ssmItems[i][3]=menuCols;
ssmItems[i][5]=menuWidth-1;
}else if(ssmItems[i][3]!=menuCols)
ssmItems[i][5]=Math.round(menuWidth*(ssmItems[i][3]/menuCols)-1);
if ( ssmItems[i-1] && ssmItems[i-1][4] != "no" ) {


document.write('<TR>');
}
if(!ssmItems[i][1]){
document.write('<td bgcolor="'+hdrBGColor+'" HEIGHT="'+hdrHeight+'" ALIGN="'+hdrAlign+'" VALIGN="'+hdrVAlign+'" WIDTH="'+ssmItems[i][5]+'" COLSPAN="'+ssmItems[i][3]+'"><font face="'+hdrFontFamily+'" Size="'+hdrFontSize+'" COLOR="'+hdrFontColor+'"> <b>'+ssmItems[i][0]+'</b></font></td>');
}else {
if(!ssmItems[i][2])
ssmItems[i][2]=linkTarget;
document.write('<TD BGCOLOR="'+linkBGColor+'" onmouseover="bgColor=\''+linkOverBGColor+'\'" onmouseout="bgColor=\''+linkBGColor+'\'" WIDTH="'+ssmItems[i][5]+'" COLSPAN="'+ssmItems[i][3]+'"><ILAYER><LAYER onmouseover="bgColor=\''+linkOverBGColor+'\'" onmouseout="bgColor=\''+linkBGColor+'\'" WIDTH="100%" ALIGN="'+linkAlign+'"><DIV ALIGN="'+linkAlign+'"><FONT face="'+linkFontFamily+'" Size="'+linkFontSize+'"> <A HREF="'+ssmItems[i][1]+'" target="'+ssmItems[i][2]+'" CLASS="ssmItems">'+ssmItems[i][0]+'</DIV></LAYER></ILAYER></TD>');
}
if(ssmItems[i][4]!="no"&&barBuilt==0){
buildBar();
barBuilt=1;
}
if(ssmItems[i][4]!="no"){
document.write('</TR>');
}
}
document.write('</table>');
if (NS6){
document.write('</TD></TR></TABLE>');
}
if (IE||NS6) {
document.write('</DIV></DIV>');
}
if (NS) {
document.write('</LAYER></ILAYER></LAYER>');
}
theleft=-menuWidth;lastY=0;setTimeout('initSlide();', 1);
}


<!--



/*

Configure menu styles below

NOTE: To edit the link colors, go to the STYLE tags and edit the ssm2Items colors

*/



b=(screen.width==800&&screen.height==600);


if(b) YOffset=0;
else YOffset=10; // no quotes!!
XOffset=0;
staticYOffset=6; // no quotes!!
slideSpeed=20 // no quotes!!
waitTime=100; // no quotes!! this sets the time the menu stays out for after the mouse goes off it.
menuBGColor="RoyalBlue";
menuIsStatic="yes"; //this sets whether menu should stay static on the screen
if(b) menuWidth=160;
else menuWidth=180; // Must be a multiple of 10! no quotes!!
menuCols=2;
hdrFontFamily="verdana";
if(b) hdrFontSize="1";
else hdrFontSize="2";
hdrFontColor="Navy";
hdrBGColor="Sandybrown";
hdrAlign="center";
hdrVAlign="center";
hdrHeight="15";
linkFontFamily="Verdana";
if(b) linkFontSize="1";
else linkFontSize="2";
linkBGColor="white";
linkOverBGColor="PaleGoldenrod";
linkTarget="_top";
linkAlign="Left";
barBGColor="Sandybrown";
barFontFamily="Verdana";
if(b) barFontSize="1";
else barFontSize="2";
barFontColor="Navy";
barVAlign="center";
barWidth=20; // no quotes!!
barText="MENU"; // <IMG> tag supported. Put exact html for an image to show.



///////////////////////////
// ssmItems[...]=[name, link, target, colspan, endrow?] - leave 'link' and 'target' blank to make a header

ssmItems[0]=["MENU"] //create header
ssmItems[1]=["Accueil", "index.htm",""] //create header
ssmItems[2]=["ST JEAN DE LUZ"]
ssmItems[3]=["Histoire", "histoire.htm",""]
ssmItems[4]=["A Voir", "a voir.htm",""] //create header
ssmItems[5]=["Ses environs", "ses environs.htm",""]
ssmItems[6]=["EGYPTE ANTIQUE"]
ssmItems[7]=["Les Dynasties", "Les Dynasties.htm",""]
ssmItems[8]=["Les Dieux", "Les Dieux.htm",""] //create header
ssmItems[9]=["LIENS"]
ssmItems[10]=["Mes Liens", "liens.htm",""]
ssmItems[11]=["COMMUNIQUER"] //create header
ssmItems[12]=["Livre d'or", "http://www.swisstools.net/guestbook.asp?numero=84955"] //create header
ssmItems[13]=["Mail", "mailto:mimi64fr@hotmail.com",""]


buildMenu();



//-->

Je vous remercie de l'aide que vous pouvez m'apporter.
Bizzzzzz
Mimi64