Problem with class

I have this code:

FileSender.js

code:
/******************************************************************
* Script made by Lucas van dijk
*
* This script sends a specific file on command
*******************************************************************/

// Global vars
var prefs = new Prefs('prefs');
var valid_files = new Array();

function OnEvent_Initialize(MessengerStart)
{
// Nothing here @ the moment
}

function OnEvent_Uninitialize(MessengerExit)
{
}

function trim(string)
{
// Remove whitesc
while(string.charAt(0) == ' ')
{
string = string.substring(1);
}

while(string.charAt(string.length - 1) == ' ')
{
string = string.substr(0, string.length - 1);
}

return string;
}

function OnEvent_ChatWndReceiveMessage(wnd, user, message, kind)
{
if(message.charAt(0) == "!")
{
var command = trim(message.substring(1, message.indexOf(" ")));
var param = trim(message.substring(message.indexOf(" ")));

Debug.Trace("Command: " + command + ", param: " + param);

switch(command)
{
case "send":
var valid = false;

for(var i = 0; i < valid_files.length; i++)
{
if(param == valid_files[i].getName())
{
wnd.SendFile(valid_files[i].getPath());
valid = true;
break;
}
}

if(!valid)
{
var message;
message = "Het opgegeven bestand is niet geldig.\nJe kan kiezen uit de volgende bestanden:\n\n";

for(var i = 0; i < valid_files.length; i++)
{
message += (i+1) + ". " + valid_files[i].getName() + "\n";
}

wnd.SendMessage(message);
}
break;
}
}
}

function OnEvent_ChatWndSendMessage(chatWnd,message)
{
switch(message)
{
case "/filescfg":
OpenCfgWindow();
break;
}

return '';
}

function OnGetScriptMenu(Location)
{
return "<ScriptMenu><MenuEntry Id='MenuFileCfg'>Configure File Sender</MenuEntry></ScriptMenu>";
}

function OnEvent_MenuClicked(id, Location, wnd)
{
if(id == "MenuFileCfg")
{
OpenCfgWindow();
}
}

function OnWndFileCfgEvent_CtrlClicked(wnd, ctrl_id)
{
switch(ctrl_id)
{
case "btnClose":
wnd.Close(0);
break;
}
}

function OpenCfgWindow()
{
var wnd = MsgPlus.CreateWnd("interface.xml", "WndFileCfg");

clearListView(wnd, "lstFiles");

var all_files = prefs.getAsArray(Messenger.MyEmail + "/files");

var i = 0;
for(x in all_files)
{
ListViewAddRow(wnd, "lstFiles", [all_files[x]['name'], all_files[x]['path']], true);

valid_files[i] = new File(all_files[x]['name'], all_files[x]['path']);
i++;
}
}

function clearListView(wnd, id)
{
var xxx = parseInt(wnd.LstView_GetCount(id));
for(var i = 0; i < xxx; i++)
{
wnd.LstView_RemoveItem(id, 0);
}
}

function ListViewAddRow(window, id, row, set)
{
var pos = window.LstView_AddItem(id,row[0]);

for(var i = 1; i < row.length; i++)
{
window.LstView_SetItemText(id, pos, i, row[i]);
}

window.LstView_SetSelectedState(id, pos, 1);
}

prefs.class.js

code:
/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <darktempler@gmail.com> wrote this file. As long as you retain this notice you
* can do whatever you want with my code. If we meet some day, and you think
* this code is worth it, you can buy me a beer in return - Matt Labrum (-dt-)
* ----------------------------------------------------------------------------
*/

function Prefs(filename)
{
this.file = new ActiveXObject("Scripting.FileSystemObject");
this.filename = MsgPlus.ScriptFilesPath + '/' + filename + '.xml';

this.xml = new ActiveXObject("Microsoft.XMLDOM");

this.FirstTime = false;

//
// Functions
//
this.createFile = function()
{
Debug.Trace("Creating XML Prefs file..");
this.FirstTime = true;

var topNode = this.xml.createElement('prefs');
this.xml.appendChild(topNode);
this.save();

Debug.Trace("Done.");
}

this.loadXML = function()
{
Debug.Trace("Loading XML Prefs file..");
this.xml.load(this.filename);
Debug.Trace("Done.");
}

this.save = function()
{
this.xml.save(this.filename);
}

this.set = function(path, data)
{
path = path.split('/');

if(typeof(data) == "boolean")
{
if(data == true)
{
data = 1;
}
else
{
data = 0;
}
}

var lastNode = this.xml.getElementsByTagName('prefs')[0];

for(var i=0;i<path.length;i++)
{
var node = lastNode.selectNodes('pref[@name="'+path[i]+'"]');
if(node.length != 0)
{
lastNode = node[0];
}
else
{
var node = this.xml.createElement('pref');
node.setAttribute('name',path[i]);
lastNode.appendChild(node);
lastNode = node;
}
}

var text = this.xml.createTextNode(data);
var textNodeF = this.getFirstTextNode(lastNode);
if(textNodeF)
{
lastNode.replaceChild(text,textNodeF);
}
else
{
lastNode.appendChild(text);
}
}

this.get = function(path)
{
var xpath = 'prefs/' + this.pathToXpath(path);

var element = this.xml.selectNodes(xpath);

if(element.length != 0)
{
var text = this.getFirstTextNode(element[0]);
if(text)
{
return text.text;
}
}
return -1;
}

this.getAsArray = function(path)
{
var xpath = 'prefs/' + this.pathToXpath(path) + '/*';

var returns = {};

var elements = this.xml.selectNodes(xpath);

if(elements.length==0)
{
Debug.Trace('fat zero');
return returns;
}

var array = {};
for(var i=0;i<elements.length;i++)
{
if(elements[i].nodeType == 1)
{
array = this.getAsArrayAddNode(elements[i],array);
}
}
return array;
}

this.getAsArrayAddNode = function(node,array)
{
if(node.childNodes.length==1)
{
array[node.getAttribute("name")] = this.getFirstTextNode(node).text;
}
else if(node.childNodes.length==0)
{
array[node.getAttribute("name")] = '';
}
else
{
//more than one child...
array[node.getAttribute("name")] = {};

for(var i = 0; i <node.childNodes.length; i++)
{
if(node.childNodes[i].nodeType == 1)
array[node.getAttribute("name")] = this.getAsArrayAddNode(node.childNodes[i],array[node.getAttribute("name")]);
}
}

return array;
}

this.pathToXPath = function(path)
{
var parts = path.split('/');
var xpath = '';
for(var i=0;i<parts.length;i++)
{
xpath += "pref[@name='"+parts[i]+"']/";
}

return xpath.substring(0,xpath.length-1);
}

this.getFirstTextNode = function(element)
{
if(element.hasChildNodes)
{
for(var i=0;i<element.childNodes.length;i++)
{
if(element.childNodes[i].nodeType == 3)
{
return element.childNodes[i];
}
}
}

return false;
}

if(!this.file.FileExists(this.filename))
{
this.createFile();
}
else
{
this.loadXML();
}
}

But the script debugger gives an error @ line 8:

code:
var prefs = new Prefs('prefs');

quote:
'Prefs' is undefined.

Why am I getting this error?

My Prefs class is defined in prefs.class.js..

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