Someone help me PLEASE!

[but2002]

I was running Windows 7, and this script worked wonderfully, but now that I'm back on XP. It's not.

Windows 7 has built in support for MP4, so I used this code to make YouTube videos load in an embedded WMP window, instead of that crappy flash player.

Windows XP does not..
However, through codecs, I got it to work, now I'm having another issue.
The Embedded player is resizing to the video, and won't stay the specified dimensions.

Does anyone know how to fix?
Here is my code for reference.

// ==UserScript==
// @name          YouTube - NoFlash-Player
// @namespace     -
// @description   replaces Flash-Player
// @include       http://*.youtube.*/watch*v=*
// @include       http://youtube.*/watch*v=*
// ==/UserScript==

var conf = new Array();

// config start:
conf["quality_default"] = "hd"; // "sd", "hq" or "hd"
conf["autostart"] = false;
conf["loop"] = false;
conf["width"] = 640;
conf["height"] = 480;
// config end

function getPlayer(qual) {
    url = getURL(qual);
    player =  "<EMBED type=\"application/x-mplayer2\"";
    player += "    width=\""+conf["width"]+"\" height=\""+conf["height"]+"\"";
    player += "    src=\""+url+"\" autostart=\""+conf["autostart"]+"\" loop=\""+conf["loop"]+"\">";
    player += "</EMBED>";
    return player
}

function getURL(qual) {
    id = document.URL.split("v=")[1];
    id = id.split("&")[0];
    flashvars = document.getElementById("movie_player").getAttribute("flashvars");
    valid = flashvars.split("&t=")[1];
    valid = valid.split("&")[0];
    downloadURL = "http://"+document.domain+"/get_video?video_id="+id+"&t="+valid;
    
    switch(qual) {
        case "sd": return downloadURL; break;
        case "hq": return downloadURL + "&fmt=18"; break;
        case "hd": return downloadURL + "&fmt=22"; break;
        default: return "";
    }
}

function isHDavail() {
    flashvars = document.getElementById("movie_player").getAttribute("flashvars");
    if (flashvars.indexOf("fmt_map=22/2000000/9/0/115")>=0) {
        return true;
    }
    else {
        return false;
    }
}

function getLinks(qual) {
    var theurl = window.content.location.href.toString();
    cleanURL = window.location.href;
    cleanURL = cleanURL.replace(/&Quality=Standard_Definition/, "");
    cleanURL = cleanURL.replace(/&Quality=High_Quality/, "");
    cleanURL = cleanURL.replace(/&hd=1&Quality=High_Definition/, "");
    
    var links;
    if (qual == "sd") {
        links = "[<b>Standard Definition</b>&nbsp;-&nbsp;<a href=\""+getURL("sd")+"\">Download</a>]&nbsp;&nbsp;&nbsp;";
    }
    else {
        links = "[<a href=\""+cleanURL+"&Quality=Standard_Definition\">Standard Definition</a>&nbsp;-&nbsp;<a href=\""+getURL("sd")+"\">Download</a>]&nbsp;&nbsp;&nbsp;";
    }
    if (qual == "hq") {
        links += "[<b>High Quality</b>&nbsp;-&nbsp;<a href=\""+getURL("hq")+"\">Download</a>]&nbsp;&nbsp;&nbsp;";
    }
    else {
        links += "[<a href=\""+cleanURL+"&Quality=High_Quality\">High Quality</a>&nbsp;-&nbsp;<a href=\""+getURL("hq")+"\">Download</a>]&nbsp;&nbsp;&nbsp;";
    }
    if (qual == "hd") {
        links += "[<b>High Definition</b>&nbsp;-&nbsp;<a href=\""+getURL("hd")+"\">Download</a>]";
    }
    else if (isHDavail()) {
        links += "[<a href=\""+cleanURL+"&Quality=High_Definition\">High Definition</a>&nbsp;-&nbsp;<a href=\""+getURL("hd")+"\">Download</a>]";
    }
    return links;
}

function replacePlayer(qual) {
    
    
    var theurl = window.content.location.href.toString();

    if (theurl.search("hd=1") == -1)
        {
        }
    else
        {
        conf["width"] = 853;
        conf["height"] = 550;
        }
    document.getElementById('watch-player-div').innerHTML = getPlayer(qual)+"<br>"+getLinks(qual);
}

function getQuality()
{
    url = document.URL;
    if (url.indexOf("Standard_Definition") >= 0) {
        return("Standard_Definition");
    }
    else if (url.indexOf("High_Quality") >= 0) {
        return("High_Quality");
    }
    else if ((url.indexOf("High_Definition") >= 0) && (isHDavail() == false)) {
        return("High_Quality");
    }
    else if ((url.indexOf("High_Definition") >= 0) && (isHDavail() == true)) {
        return("High_Definition");
    }
    else {
        if (conf["quality_default"] == "sd") {
            return("Standard_Definition");
        }
        else if (conf["quality_default"] == "hq") {
            return("High_Quality");
        }
        else if ((conf["quality_default"] == "hd") && (isHDavail() == false)) {
            return("High_Quality");
        }
        else if ((conf["quality_default"] == "hd") && (isHDavail() == true)) {
            return("High_Definition");
        }
    }
}

qualtiy = getQuality();
if (qualtiy == "Standard_Definition") {
    replacePlayer("sd");
}
else if (qualtiy == "High_Quality") {
    replacePlayer("hq");
}
else if (qualtiy == "High_Definition") {
    replacePlayer("hd");
}

I guess I should also say, that even with the "AutoStart" set to false, it's still automatically playing.
Does anyone know what's going on!?