COM excel SaveAs - Web Page?

Hi,

I am trying to allow my Intranet users to upload their Microsoft Office
Documents
and then have them viewed as .html files.

So far, through COM i am able to get WORD documents to convert via this
method

function method_convert_word (){
$_object_word_app = new COM
("Word.application");
$_object_word_doc = new COM
("Word.document");

$_object_word_doc =
$_object_word_app->Documents->Open ($this->path_doc);
$_object_word_doc->SaveAs
($this->path_html,8);

$_object_word_doc = null;
$_object_word_app->Quit();
$_object_word_app = null;

}

But how would i get this to work on an EXCEL document? This is as far as i
have got:

function method_convert_excel (){
$_object_excel_sheet = new COM
("Excel.sheet");
$_object_excel_sheet->Application->Visible = 0;

$_object_excel_sheet->Application->DisplayAlerts = 0;

$_object_excel_workbook =
$_object_excel_sheet->application->Workbooks->Open ($this->path_doc);

$_object_excel_sheet->Application->ActiveWorkBook->SaveAs($this->path_html);
// Here lies my problem!!!!


$_object_excel_sheet->Application->ActiveWorkbook->Close ("False");
unset ($_object_excel_sheet);
}

Can anyone help?
And does anyone know where i can find a set of PHP COM commands for EXCEL.

Thanks for your time
Kyle

email - kward_sunint_co_za