Microsoft Outlook email - add HTML signature within an HTML message

I'm not really sure what I'm doing or what I'm doing incorrectly. I'm
trying to add my signature to a macro that i've created. Here is the
macro:

'code added to use signature
Function GetBoiler(ByVal sFile As String) As String
'Dick Kusleika
Dim fso As Object
Dim ts As Object
Set fso = CreateObject("Scripting.FileSystemObject")
Set ts = fso.GetFile(sFile).OpenAsTextStream(1, -2)
GetBoiler = ts.readall
ts.Close
End Function

'start original code
Sub Send_Files()
'Working in 2000-2007
Dim OutApp As Object
Dim OutMail As Object
Dim sh As Worksheet
Dim cell As Range, FileCell As Range, rng As Range
Dim strbody As String
Dim SigString As String
Dim Signature As String

With Application
.EnableEvents = False
.ScreenUpdating = False
End With

Set sh = Sheets("Sheet1")

Set OutApp = CreateObject("Outlook.Application")
OutApp.Session.Logon

For Each cell In
sh.Columns("B").Cells.SpecialCells(xlCellTypeConst ants)

'Enter the file names in the C:Z column in each row
Set rng = sh.Cells(cell.Row, 1).Range("C1:Z1")

If cell.Value Like "?*@?*.?*" And _
Application.WorksheetFunction.CountA(rng) 0 Then
Set OutMail = OutApp.CreateItem(0)

With OutMail
.To = cell.Value
.Subject = "FEBRUARY 2007 COMMISSION STATEMENT"
strbody = "Good Afternoon," & vbNewLine & vbNewLine &
_
"Attached is your February 2007 Commission
Statement. Please note that the travel and entertainment figures have
been updated to reflect the current amounts as of February 2007. If
you should have any questions or concerns, please be sure to fill out
the "Sales Commissions Inquiry Form". Have a great day." & vbNewLine
& _
"Thanks,"
.Body = strbody

'this is the signature code Ive added
SigString = "C:\Documents and Settings\valejill
\Application Data\Microsoft\Signatures\Signature1.htm"
If Dir(SigString) "" Then
Signature = GetBoiler(SigString)
Else
Signature = ""
End If

On Error Resume Next
With OutMail
.To = "
.CC = ""
.BCC = ""
.Subject = "This is the Subject line"
.HTMLBody = strbody & "brbr" & Signature
'You can add files also like this
'.Attachments.Add ("C:\test.txt")
.Send 'or use .Display
End With

On Error GoTo 0
Set OutMail = Nothing
Set OutApp = Nothing

'resume original code
For Each FileCell In rng.SpecialCells(xlCellTypeConstants)
If Trim(FileCell) "" Then
If Dir(FileCell.Value) "" Then
.Attachments.Add FileCell.Value
End If
End If
Next FileCell
.Send 'Or use Display
End With

Set OutMail = Nothing
End If
Next cell

Set OutApp = Nothing

With Application
.EnableEvents = True
.ScreenUpdating = True
End With

End Sub

I've tried to seperate the code I know that works from the signature
add ins. Please let me know what syntax is incorrect. Thanks!!