Help!!! Exporting data to excel

Hi,

I am trying to export mysql data to excel. The query i use to call is :

$result=mysql_query("select no1, no2, tool1, tool2, tool3, tool4, tool5, tool6, tool7, tool8, DATE_FORMAT(dReceived, '%d %b %Y') AS dReceived, DATE_FORMAT(dShipment, '%d %b %Y') AS dShipment from table1 where dReceived LIKE '$year-$m-%' UNION select no1, no2, tool1, tool2, tool3, tool4, tool5, tool6, tool7, tool8, DATE_FORMAT(dReceived, '%d %b %Y') AS dReceived, DATE_FORMAT(dShipment, '%d %b %Y') AS dShipment from table2 where dReceived LIKE '$year-$m-%' order by no1 asc");

and the function is:

// Functions for export to excel.
function xlsBOF() {
echo pack("ssssss", 0x809, 0x8, 0x0, 0x10, 0x0, 0x0);
return;
}
function xlsEOF() {
echo pack("ss", 0x0A, 0x00);
return;
}
function xlsWriteNumber($Row, $Col, $Value) {
echo pack("sssss", 0x203, 14, $Row, $Col, 0x0);
echo pack("d", $Value);
return;
}
function xlsWriteLabel($Row, $Col, $Value ) {
$L = strlen($Value);
echo pack("ssssss", 0x204, 8 + $L, $Row, $Col, 0x0, $L);
echo $Value;
return;
}

It is success but the output of no1 it just display the number but i want in 5 digit.

what i mean is column no1 it disply in excel now is 311 but i want it to display in 00311.

can anyone help me??

Thanks.