Can someone please give a hint on how to convert multiple excel worksheets from a single excel workbook.

I have a piece of code that will convert the first worksheet in the workbook but no more than that:

Code:
Set objArgs = WScript.Arguments
For I = 0 to objArgs.Count - 1

    FullName = objArgs(I)
    FileName = Left(objArgs(I), InstrRev(objArgs(I), ".") )

    Set objExcel = CreateObject("Excel.application")
    set objExcelBook = objExcel.Workbooks.Open(FullName)

    objExcel.application.visible=false
    objExcel.application.displayalerts=false

    objExcelBook.SaveAs FileName & "csv", 23

    objExcel.Application.Quit
    objExcel.Quit   

    Set objExcel = Nothing
    set objExcelBook = Nothing

Next
Is it possible to do more than one worksheet?

Any help on this would be greatly appreciated.