php + download excel

[Lakshmipathi]

Hi all,
I'm exporting data to excel file in php,but the data starts at middle of excel sheet.
How to correct this?
Here is sample code with i used,

$header = "Number  \t Color \tSize ";
$filename="product";
//Fetch data and assign to $data
$data = "a";
$data .= "b";
//sent the data to browser 
header("Content-type: application/x-msdownload");
		header("Content-Disposition: attachment; filename=" . $filename . ".xls");
		header("Pragma: no-cache");
		header("Expires: 0");
		print "\n$header";
		print "\n$data";

Thanks

[Lakshmipathi]

i found this at google.....now excel files contents comes at second line ...(that's huge improvement .....

    ob_end_clean();
   ini_set('zlib.output_compression','Off');
    header('Pragma: public');
   // header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");                  // Date in the past   
  //  header('Last-Modified: '.gmdate('D, d M Y H:i:s') . ' GMT');
 	 header('Cache-Control: no-store, no-cache, must-revalidate');     // HTTP/1.1
 	header('Cache-Control: pre-check=0, post-check=0, max-age=0');    // HTTP/1.1
  //  header ("Pragma: no-cache");
    header("Expires: 0");
    header('Content-Transfer-Encoding: none');
    header('Content-Type: application/vnd.ms-excel;');                 // This should work for IE & Opera
    header("Content-type: application/x-msexcel");                    // This should work for the rest