Não Funciona no Firefox

Olá Pessoal, não entendo muito de javascript, peguei um codigo pronto de tirar borda do flash e colocar gradiente sem imagem mas não está funcionando no Firefox só funciona no IE, alguem pode me falar o que está errado nesse codigo:

//v1.0
//Copyright 2006 Adobe Systems, Inc. All rights reserved.
function AC_AddExtension(src, ext)
{
if (src.indexOf('?') != -1)

	return src.replace(/\?/, ext+'?');
 else
	return src + ext;
}

function AC_Generateobj(objAttrs, params, embedAttrs)

 var str = '<object ';
 for (var i in objAttrs)
	str += i + '="' + objAttrs[i] + '" ';
 str += '>';
 for (var i in params)
	str += '<param name="' + i + '" value="' + params[i] + '" /> ';
 str += '<embed ';
 for (var i in embedAttrs)
	str += i + '="' + embedAttrs[i] + '" ';
 str += ' ></embed></object>';

 document.write(str);
}

function AC_FL_RunContent(){
 var ret =
	AC_GetArgs
	( arguments, ".swf", "movie", "clsid:d27cdb6e-ae6d-11cf-96b8-444553540000"
 , "application/x-shockwave-flash"
	);
 AC_Generateobj(ret.objAttrs, ret.params, ret.embedAttrs);
}

function AC_SW_RunContent(){
 var ret =
	AC_GetArgs
	( arguments, ".dcr", "src", "clsid:166B1BCA-3F9C-11CF-8075-444553540000"
 , null
	);
 AC_Generateobj(ret.objAttrs, ret.params, ret.embedAttrs);
}

function AC_GetArgs(args, ext, srcParamName, classid, mimeType){
 var ret = new Object();
 ret.embedAttrs = new Object();
 ret.params = new Object();
 ret.objAttrs = new Object();
 for (var i=0; i < args.length; i=i+2){
	var currArg = args[i].toLowerCase();

	switch (currArg){
 case "classid":
 break;
 case "pluginspage":
 ret.embedAttrs[args[i]] = args[i+1];
 break;
 case "src":
 case "movie":
 args[i+1] = AC_AddExtension(args[i+1], ext);
 ret.embedAttrs["src"] = args[i+1];
 ret.params[srcParamName] = args[i+1];
 break;
 case "onafterupdate":
 case "onbeforeupdate":
 case "onblur":
 case "oncellchange":
 case "onclick":
 case "ondblClick":
 case "ondrag":
 case "ondragend":
 case "ondragenter":
 case "ondragleave":
 case "ondragover":
 case "ondrop":
 case "onfinish":
 case "onfocus":
 case "onhelp":
 case "onmousedown":
 case "onmouseup":
 case "onmouseover":
 case "onmousemove":
 case "onmouseout":
 case "onkeypress":
 case "onkeydown":
 case "onkeyup":
 case "onload":
 case "onlosecapture":
 case "onpropertychange":
 case "onreadystatechange":
 case "onrowsdelete":
 case "onrowenter":
 case "onrowexit":
 case "onrowsinserted":
 case "onstart":
 case "onscroll":
 case "onbeforeeditfocus":
 case "onactivate":
 case "onbeforedeactivate":
 case "ondeactivate":
 case "type":
 case "codebase":
 ret.objAttrs[args[i]] = args[i+1];
 break;
 case "width":
 case "height":
 case "align":
 case "vspace":
 case "hspace":
 //case "class":
 case "title":
 case "accesskey":
 case "name":
 case "id":
 case "tabindex":
 ret.embedAttrs[args[i]] = ret.objAttrs[args[i]] = args[i+1];
 break;
 default:
 ret.embedAttrs[args[i]] = ret.params[args[i]] = args[i+1];
	}
 }
 ret.objAttrs["classid"] = classid;
 if (mimeType) ret.embedAttrs["type"] = mimeType;
 return ret;
}

/*************************
CÓDIGO PARA CRIAÇÃO DE DEGRADÊ SEM IMAGEM
*************************/

window.addEventListener?window.addEventListener("load",createGradient,false):window.attachEvent("onload",createGradient);

function createGradient() {
	if(!document.getElementById)return;

	objArray = getGradientObjects();
	if(!objArray.length) return;

	for(j=0;j<objArray.length;j++) {
 params = objArray[j].className.split(" ");
 if(document.all && !window.opera) {
 objArray[j].style.width = objArray[j].offsetWidth + "px";
 params[3] == "horizontal"?gType = 1:gType = 0;
 objArray[j].style.filter = "progid:DXImageTransform.Microsoft.Gradient(GradientType="+gType+",StartColorStr=\"#" + params[1] + "\",EndColorStr=\"#" + params[2] + "\")";
	} else {
 colorArray = createColorPath(params[1],params[2]);
 x=0;y=0;
 if(params[3] == "horizontal") {
 w=Math.round(objArray[j].offsetWidth/colorArray.length);
 if(!w)w=1;
 h = objArray[j].offsetHeight;
 } else {
 h = Math.round(objArray[j].offsetHeight/colorArray.length);
 if(!h) h =1;
 w = objArray[j].offsetWidth;
 }
 makeGrandParent(objArray[j]);
 tmpDOM = document.createDocumentFragment();
 for(p=0;p<colorArray.length;p++) {
 g = document.createElement("div");
 g.setAttribute("style","position:absolute;z-index:0;top:" + y + "px;left:" + x + "px;height:" + h + "px;width:" + w + "px;background-color:rgb(" + colorArray[p][0] + "," + colorArray[p][1] + "," + colorArray[p][2] + ");");
 params[3] == "horizontal"?x+=w:y+=h;
 tmpDOM.appendChild(g);
 if(y>=objArray[j].offsetHeight || x >= objArray[j].offsetWidth) break;
 }
 objArray[j].appendChild(tmpDOM);
 tmpDOM = null;
 }
	}
}

function getGradientObjects() {
	a = document.getElementsByTagName("*");
	objs = new Array();
	for(j=0;j<a.length;j++) {
 c = a[j].className;
 if(c != "") if(c.indexOf("gradient") == 0) objs[objs.length] = a[j];
	}
	return objs;
}

function createColorPath(color1,color2) {
	colorPath = new Array();
	colorPercent = 1.0;
	do {
 colorPath[colorPath.length]=setColorHue(longHexToDec(color1),colorPercent,longHexToDec(color2));
 colorPercent-=.01;
	} while(colorPercent>0);
	return colorPath;
}

function setColorHue(originColor,opacityPercent,maskRGB) {
	returnColor=new Array();
	for(w=0;w<originColor.length;w++) returnColor[w] = Math.round(originColor[w]*opacityPercent) + Math.round(maskRGB[w]*(1.0-opacityPercent));
	return returnColor;
}

function longHexToDec(longHex) {
	return new Array(toDec(longHex.substring(0,2)),toDec(longHex.substring(2,4)),toDec(longHex.substring(4,6)));
}

function toDec(hex) {
	return parseInt(hex,16);
}

function makeGrandParent(obj) {
	disp = document.defaultView.getComputedStyle(obj,'').display;
	disp == "block"?nSpan = document.createElement("div"):	nSpan = document.createElement("span");
	mHTML = obj.innerHTML;
	obj.innerHTML = "";
	nSpan.innerHTML = mHTML;
	nSpan.setAttribute("style","position:relative;z-index:10;");
	obj.appendChild(nSpan);
}

ME ajudem ai, valeu pessoal T+