javascript problem

Hallo.

habe eine Seite mit einem flashfilm und einer htmlnavigation.
über diese navigation erhält der flashfilm eine javascript-variable den den film dann anweist auf eine bestimmte position zu gehen.

also
<a href="content.php?tpl=rubrik&rubrik=1&page=0" onmouseover="changeMain(this.id);status='ORTE//MENSCHEN';return true" onmouseout="status='';return true" onfocus="if(this.blur){this.blur()}" id="1" ><img src="_img/_navi/rubrik1.gif" width="124" height="26" border="0" id="rubrik1"></a>
die id wird übergeben und im flash film gehts dann weiter:
if(testvar1 == 0){
setProperty("/animation_produkte", _x, 100);
setProperty("/animation", _x, 100);
}else{
setProperty("/animation_produkte", _x, var2);
setProperty("/animation", _x, var1);
}

in allen browsern geht das
netscape, mozilla, opera und ie

bei firefox kommt dieser fehler (konsole)
Fehler: document[movieid].SetVariable is not a function
Quelldatei: file:///C:/Dokumente%20und%20Einstellungen/Administrator/Desktop/deu/DEMO/content_alte_navi.html
Zeile: 321
und zeile 321 ist:
document[movieid].SetVariable(values[0],values[1]);

nun ist mein problem auch, dass ich die browserdetection von firefox nicht finde ich habe mal ausprobiert:
this.isFirefox = (ua.indexOf('firefox')!=-1);

hier die komplette version:
// Detection snippet from http://www.dithered.com/javascript/browser_detect/index.html
// -----------------------------------------------------------
//var ua = navigator.userAgent.toLowerCase();
//var is_pc_ie = ( (ua.indexOf('msie') != -1 ) && ( ua.indexOf('win') != -1 ) && ( ua.indexOf('opera') == -1 ) && ( ua.indexOf('webtv') == -1 ) );
function BrowserDetect() {
//
if (navigator.userAgent.indexOf("Firefox")!=-1)
alert("This script may not be compatable with FireFox.")
/*
if(navigator.appName == "WebTV")
{
alert("This script may not be compatable with WebTV.")
}
if (navigator.userAgent.indexOf("Netscape")!=-1)
{
alert("You need Firefox or Internet Explorer to view this script.");
window.location = "http://jdstiles.com/java/ns.html"
}

if (navigator.userAgent.indexOf("Opera")!=-1)
{
alert("You need Firefox or Internet Explorer to view this script.");
window.location = "http://jdstiles.com/java/ns.html"
}
*/
var ua = navigator.userAgent.toLowerCase();

// browser engine name
this.isGecko = (ua.indexOf('gecko') != -1 && ua.indexOf('safari') == -1);
this.isAppleWebKit = (ua.indexOf('applewebkit') != -1);

// browser name
this.isKonqueror = (ua.indexOf('konqueror') != -1);
this.isSafari = (ua.indexOf('safari') != - 1);
this.isOmniweb = (ua.indexOf('omniweb') != - 1);
this.isOpera = (ua.indexOf('opera') != -1);
this.isIcab = (ua.indexOf('icab') != -1);
this.isAol = (ua.indexOf('aol') != -1);
this.isIE = (ua.indexOf('msie') != -1 && !this.isOpera && (ua.indexOf('webtv') == -1) );
this.isMozilla = (this.isGecko && ua.indexOf('gecko/') + 14 == ua.length);
this.isFirebird = (ua.indexOf('firebird/') != -1);
this.isNS = ( (this.isGecko) ? (ua.indexOf('netscape') != -1) : ( (ua.indexOf('mozilla') != -1) && !this.isOpera && !this.isSafari && (ua.indexOf('spoofer') == -1) && (ua.indexOf('compatible') == -1) && (ua.indexOf('webtv') == -1) && (ua.indexOf('hotjava') == -1) ) );
//this.isFirefox = (ua.indexOf('firefox')!=-1); //club basic
// spoofing and compatible browsers
this.isIECompatible = ( (ua.indexOf('msie') != -1) && !this.isIE);
this.isNSCompatible = ( (ua.indexOf('mozilla') != -1) && !this.isNS && !this.isMozilla);

// rendering engine versions
this.geckoVersion = ( (this.isGecko) ? ua.substring( (ua.lastIndexOf('gecko/') + 6), (ua.lastIndexOf('gecko/') + 14) ) : -1 );
this.equivalentMozilla = ( (this.isGecko) ? parseFloat( ua.substring( ua.indexOf('rv:') + 3 ) ) : -1 );
this.appleWebKitVersion = ( (this.isAppleWebKit) ? parseFloat( ua.substring( ua.indexOf('applewebkit/') + 12) ) : -1 );

// browser version
this.versionMinor = parseFloat(navigator.appVersion);

// correct version number
if (this.isGecko && !this.isMozilla) {
this.versionMinor = parseFloat( ua.substring( ua.indexOf('/', ua.indexOf('gecko/') + 6) + 1 ) );
}
else if (this.isMozilla) {
this.versionMinor = parseFloat( ua.substring( ua.indexOf('rv:') + 3 ) );
}
else if (this.isIE && this.versionMinor >= 4) {
this.versionMinor = parseFloat( ua.substring( ua.indexOf('msie ') + 5 ) );
}
else if (this.isKonqueror) {
this.versionMinor = parseFloat( ua.substring( ua.indexOf('konqueror/') + 10 ) );
}
else if (this.isSafari) {
this.versionMinor = parseFloat( ua.substring( ua.lastIndexOf('safari/') + 7 ) );
}
else if (this.isOmniweb) {
this.versionMinor = parseFloat( ua.substring( ua.lastIndexOf('omniweb/') + 8 ) );
}
else if (this.isOpera) {
this.versionMinor = parseFloat( ua.substring( ua.indexOf('opera') + 6 ) );
}
else if (this.isIcab) {
this.versionMinor = parseFloat( ua.substring( ua.indexOf('icab') + 5 ) );
}

this.versionMajor = parseInt(this.versionMinor);

// dom support
this.isDOM1 = (document.getElementById);
this.isDOM2Event = (document.addEventListener && document.removeEventListener);

// css compatibility mode
this.mode = document.compatMode ? document.compatMode : 'BackCompat';

// platform
this.isWin = (ua.indexOf('win') != -1);
this.isWin32 = (this.isWin && ( ua.indexOf('95') != -1 ua.indexOf('98') != -1 ua.indexOf('nt') != -1 ua.indexOf('win32') != -1 ua.indexOf('32bit') != -1 ua.indexOf('xp') != -1) );
this.isMac = (ua.indexOf('mac') != -1);
this.isUnix = (ua.indexOf('unix') != -1 ua.indexOf('sunos') != -1 ua.indexOf('bsd') != -1 ua.indexOf('x11') != -1)
this.isLinux = (ua.indexOf('linux') != -1);

// specific browser shortcuts
this.isNS4x = (this.isNS && this.versionMajor == 4);
this.isNS40x = (this.isNS4x && this.versionMinor < 4.5);
this.isNS47x = (this.isNS4x && this.versionMinor >= 4.7);
this.isNS4up = (this.isNS && this.versionMinor >= 4);
this.isNS6x = (this.isNS && this.versionMajor == 6);
this.isNS6up = (this.isNS && this.versionMajor >= 6);
this.isNS7x = (this.isNS && this.versionMajor == 7);
this.isNS7up = (this.isNS && this.versionMajor >= 7);

this.isIE4x = (this.isIE && this.versionMajor == 4);
this.isIE4up = (this.isIE && this.versionMajor >= 4);
this.isIE5x = (this.isIE && this.versionMajor == 5);
this.isIE55 = (this.isIE && this.versionMinor == 5.5);
this.isIE5up = (this.isIE && this.versionMajor >= 5);
this.isIE6x = (this.isIE && this.versionMajor == 6);
this.isIE6up = (this.isIE && this.versionMajor >= 6);

this.isIE4xMac = (this.isIE4x && this.isMac);
}
var is_pc_ie = new BrowserDetect();

ich würde mich freun wenn mir da jemand weiter helfen kann

beste grüss
robert