VBScript Help

[psycho]

i am trying to code a vbscript to tell me where a username is logged into on a domain running xp machines and 2k3 svr, here is what i have......can you help?????

'================================================================
'VBScript to find where a user is logged into
'Written by Psycho
'================================================================

Dim WshShell : Set WshShell = WScript.CreateObject("WScript.Shell")
Dim WshNetwork : Set WshNetwork = WScript.CreateObject("WScript.Network")
Dim objArgs : Set objArgs = WScript.Arguments ' create object with collection
Dim fso : Set fso = WScript.CreateObject("Scripting.FilesystemObject")
Const ForReading=1, ForWriting=2


If objArgs.Count >= 1 Then
strUserName = objArgs(0) 'assign the passed user name to a variable
Else 'quit the script, no variable given, or too many variables passed
strUserName = InputBox("Enter the name of the individual you wish to query",,WshNetwork.UserName)
If strUserName = "" Then WScript.Quit
End If

If IsNull(strUserName) OR strUserName = "" Then WScript.Quit

OutputFilePath = "c:ip1.txt"

' Flush the cache
WshShell.Run "cmd /c nbtstat.exe -R", 2, False
WScript.Sleep 1000
' Send a message to the user
WshShell.Run "cmd /c net send " & strUserName & " Test locator message.", 2, True
WScript.Sleep 1000
' check the local machines cache, looking for UNIQUE
WshShell.Run "cmd /c nbtstat.exe -c | find ""UNIQUE"" > " & OutputFilePath, 2, True
WScript.Sleep 1000

On Error Resume Next

Dim objFile : Set objFile = fso.OpenTextFile(OutputFilePath, ForReading)
Dim strIPAddress : strIPAddress = Trim(Mid(objFile.ReadLine,42,15)) 'read the line

' Nobody home
If Err.Number <> 0 Then
WshShell.Popup "User '" & UCASE(strUserName) & "' is most likely not logged on anywhere.", 8, "User not found"
objFile.Close
fso.DeleteFile(OutputFilePath) 
WScript.Quit
End If
objFile.Close

WshShell.Run ("cmd /c nbtstat.exe -A " & strIPAddress & " > " & OutputFilePath)
WScript.Sleep 1000

Set objFile = fso.OpenTextFile(OutputFilePath, ForReading)

Do While objFile.AtEndOfStream <> True
aline=Trim(objFile.Readline) 'read a line
SearchString = "<20>" '20 says file sharing is installed and enabled. See Below!!
MyPos = Instr(1, aline, SearchString, 1) ' A textual comparison starting at
If MyPos <> 0 Then
strComputerName = Trim(Left(aline, (MyPos-1)))
MsgBox "Machine Name: " & strComputerName
End If
Loop

objFile.Close
Set objFile = Nothing
fso.DeleteFile(OutputFilePath) 

' when running nbtstat, these are the codes
'00 Base computer name and Workgroups 
'01 Master Browser 
'03 Message Alert service (name of logged in user) 
'20 Resource Sharing `server service` name 
'1B Domain master-browser name 
'1C Domain controller name 
'1E Domain/workgroup master browser election announcement