Save with a different name

I have this code :
Newdoc.SaveAs TextBox1 & ".doc"
It works except when the file "TextBox1.doc" already exist.

Is there a way to say : if the file "TextBox1.doc" exist then SaveAs "TextBox12.doc". ?

'does file exist using fso

Dim sFile$

sFile = "Name And Path Of Your File"

Dim fs As Object
Set fs = CreateObject("Scripting.FileSystemObject")

If fs.fileexists(sFile$) = True Then
MsgBox "File Exists...Your code here!"
Else
MsgBox "Does Not Exist...Your code here!"
End If
Set fs = Nothing

Thanks HeSaidJoe.
But what if I want a code that automatically save the document with a +1 at the end.
I mean if document1.doc exist then saveas document2.doc, if document2.doc exist then saveas document3.doc, and so on.
Do you have any idea ?

Here's a function (I used code from HeSaidJoe)
Click on Project|References and add "Microsoft Scripting Runtime"

Code:

---

' This will return True if saved, and False if not
Public Function SaveNextInstance(ByVal f as String) as Boolean
    Dim fs As Scripting.FileSystemObject
    Dim docnum as Integer

    Set fs = New FileSystemObject

    If fs.FileExists(f) then
        On Error Goto ErrorHandler
        docnum = Int(Val(Mid(f, Len(f) - 7, 3)
        docnum = docnum + 1
        f = Mid(f, 1, Len(f) - 7) & Format(docnum, "0##") & ".doc"
    Else
        On Error Goto ErrorHandler
        f = f & "000.doc"
    End if

    NewDoc.SaveAs f
    SaveNextInstance = True
    Exit Function

ErrorHandler:
    SaveNextInstance = False

End Function

---

I haven't tested it, but it should work.

Thanks for all this code, it'll help me a lot.