excel urlencode function

Public Function UrlEncode(ByRef szString As String) As String

Dim szChar As String
Dim szTemp As String
Dim szCode As String
Dim szHex As String
Dim szBin As String
Dim iCount1 As Integer
Dim iCount2 As Integer
Dim iStrLen1 As Integer
Dim iStrLen2 As Integer
Dim lResult As Long
Dim lAscVal As Long
szString = Trim$(szString)
iStrLen1 = Len(szString)
For iCount1 = 1 To iStrLen1
    szChar = Mid$(szString, iCount1, 1)
    lAscVal = AscW(szChar)
    If lAscVal >= &H0 And lAscVal <= &HFF Then
        If (lAscVal >= &H30 And lAscVal <= &H39) Or (lAscVal >= &H41 And lAscVal <= &H5A) Or (lAscVal >= &H61 And lAscVal <= &H7A) Then
            szCode = szCode & szChar
            szCode = szCode & "%" & Hex(AscW(szChar))
        End If
    Else
        szHex = Hex(AscW(szChar))
        iStrLen2 = Len(szHex)
        For iCount2 = 1 To iStrLen2
            szChar = Mid$(szHex, iCount2, 1)
            Select Case szChar
                Case Is = "0"
                    szBin = szBin & "0000"
                Case Is = "1"
                    szBin = szBin & "0001"
                Case Is = "2"
                    szBin = szBin & "0010"
                Case Is = "3"
                    szBin = szBin & "0011"
                Case Is = "4"
                    szBin = szBin & "0100"
                Case Is = "5"
                    szBin = szBin & "0101"
                Case Is = "6"
                    szBin = szBin & "0110"
                Case Is = "7"
                    szBin = szBin & "0111"
                Case Is = "8"
                    szBin = szBin & "1000"
                Case Is = "9"
                    szBin = szBin & "1001"
                Case Is = "A"
                    szBin = szBin & "1010"
                Case Is = "B"
                    szBin = szBin & "1011"
                Case Is = "C"
                    szBin = szBin & "1100"
                Case Is = "D"
                    szBin = szBin & "1101"
                Case Is = "E"
                    szBin = szBin & "1110"
                Case Is = "F"
                    szBin = szBin & "1111"
                Case Else
            End Select
        Next iCount2
        szTemp = "1110" & Left$(szBin, 4) & "10" & Mid$(szBin, 5, 6) & "10" & Right$(szBin, 6)
        For iCount2 = 1 To 24
            If Mid$(szTemp, iCount2, 1) = "1" Then
                lResult = lResult + 1 * 2 ^ (24 - iCount2)
            Else: lResult = lResult + 0 * 2 ^ (24 - iCount2)
            End If
        Next iCount2
        szTemp = Hex(lResult)
        szCode = szCode & "%" & Left$(szTemp, 2) & "%" & Mid$(szTemp, 3, 2) & "%" & Right$(szTemp, 2)
    End If
    szBin = vbNullString
    lResult = 0
Next iCount1
UrlEncode = szCode

End Function