[JS] Que veut dire ce code?

Bonjour,

J'aurais besoin de votre aide. J'ai trouvé un fichier .js qui fait exactement ce que je veux faire sauf que je n'y comprends rien à ce script et j'aimerais comprendre! Pourriez-vous me le commenter? ça m'aiderai beaucoup!

var FlashObject = function(swf, id, w, h, ver, c) {
this.swf = swf;
this.id = id;
this.width = w;
this.height = h;
this.version = ver;
this.align = "middle";

this.params = new Object();
this.variables = new Object();

this.redirect = "";
this.sq = document.location.search.split("?")[1] || "";
this.bypassTxt = "<p>Already have Macromedia Flash Player? <a href='?detectflash=false&"+ this.sq +"'>Click here if you have Flash Player "+ this.version +" installed</a>.</p>";

if (c) this.color = this.addParam('bgcolor', c);
this.addParam('quality', 'high'); // default to high
this.doDetect = getQueryParamValue('detectflash');
}

var FOP = FlashObject.prototype;

FOP.addParam = function(name, value) { this.params[name] = value; }

FOP.getParams = function() { return this.params; }

FOP.getParam = function(name) { return this.params[name]; }

FOP.addVariable = function(name, value) { this.variables[name] = value; }

FOP.getVariable = function(name) { return this.variables[name]; }

FOP.getVariables = function() { return this.variables; }

FOP.getParamTags = function() {
var paramTags = "";
for (var param in this.getParams()) {
paramTags += '<param name="' + param + '" value="' + this.getParam(param) + '" />';
}
return (paramTags == "") ? false:paramTags;
}

FOP.getHTML = function() {
var flashHTML = "";
if (navigator.plugins && navigator.mimeTypes.length) { // netscape plugin architecture
flashHTML += '<embed type="application/x-shockwave-flash" src="' + this.swf + '" width="' + this.width + '" height="' + this.height + '" id="' + this.id + '" align="' + this.align + '"';
for (var param in this.getParams()) {
flashHTML += ' ' + param + '="' + this.getParam(param) + '"';
}
if (this.getVariablePairs()) {
flashHTML += ' flashVars="' + this.getVariablePairs() + '"';
}
flashHTML += '></embed>';
} else { // PC IE
flashHTML += '<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="' + this.width + '" height="' + this.height + '" name="' + this.id + '" align="' + this.align + '">';
flashHTML += '<param name="movie" value="' + this.swf + '" />';
if (this.getParamTags()) {
flashHTML += this.getParamTags();
}
if (this.getVariablePairs() != null) {
flashHTML += '<param name="flashVars" value="' + this.getVariablePairs() + '" />';
}
flashHTML += '</object>';
}
return flashHTML;
}

FOP.getVariablePairs = function() {
var variablePairs = new Array();
for (var name in this.getVariables()) {
variablePairs.push(name + "=" + escape(this.getVariable(name)));
}
return (variablePairs.length > 0) ? variablePairs.join("&"):false;
}

FOP.write = function(elementId) {
if(detectFlash(this.version) || this.doDetect=='false') {
if (elementId) {
document.getElementById(elementId).innerHTML = this.getHTML();
} else {
document.write(this.getHTML());
}
} else {
if (this.redirect != "") {
document.location.replace(this.redirect);
} else if (this.altTxt) {
if (elementId) {
document.getElementById(elementId).innerHTML = this.altTxt +""+ this.bypassTxt;
} else {
document.write(this.altTxt +""+ this.bypassTxt);
}
}
}
}

/* ---- detection functions ---- */
function getFlashVersion() {
var flashversion = 0;
if (navigator.plugins && navigator.mimeTypes.length) {
var x = navigator.plugins["Shockwave Flash"];
if(x && x.description) {
var y = x.description;
flashversion = y.charAt(y.indexOf('.')-1);
var aux= y.charAt(y.indexOf('.')-2);
if("0123456789".indexOf(aux)!=-1) flashversion=aux+flashversion;
}
} else {
result = false;
for(var i = 15; i >= 3 && result != true; i--){
execScript('on error resume next: result = IsObject(CreateObject("ShockwaveFlash.ShockwaveFlash.'+i+'"))','VBScript');
flashversion = i;
}
}
return flashversion;
}

function detectFlash(ver) { return (getFlashVersion() >= ver) ? true:false; }

// get value of query string param
function getQueryParamValue(param) {
var q = document.location.search || document.location.href.split("#")[1];
if (q) {
var detectIndex = q.indexOf(param +"=");
var endIndex = (q.indexOf("&", detectIndex) > -1) ? q.indexOf("&", detectIndex) : q.length;
if (q.length > 1 && detectIndex > -1) {
return q.substring(q.indexOf("=", detectIndex)+1, endIndex);
} else {
return "";
}
}
}

/* add Array.push if needed */
if(Array.prototype.push == null){
Array.prototype.push = function(item) { this[this.length] = item; return this.length; }
}



Merci!