VBScript: URLEncode Function

Function URLEncode(ByVal str)
 Dim strTemp, strChar
 Dim intPos, intASCII
 strTemp = ""
 strChar = ""
 For intPos = 1 To Len(str)
  intASCII = Asc(Mid(str, intPos, 1))
  If intASCII = 32 Then
   strTemp = strTemp & "+"
  ElseIf ((intASCII < 123) And (intASCII > 96)) Then
   strTemp = strTemp & Chr(intASCII)
  ElseIf ((intASCII < 91) And (intASCII > 64)) Then
   strTemp = strTemp & Chr(intASCII)
  ElseIf ((intASCII < 58) And (intASCII > 47)) Then
   strTemp = strTemp & Chr(intASCII)
  Else
   strChar = Trim(Hex(intASCII))
   If intASCII < 16 Then
    strTemp = strTemp & "%0" & strChar
   Else
    strTemp = strTemp & "%" & strChar
   End If
  End If
 Next
 URLEncode = strTemp
End Function