Get HTML Table width php

function getHtmlTable($result){
    // receive a record set and print
    // it into an html table
    $out = '<table>';
    for($i = 0; $i < mysql_num_fields($result); $i++){
        $aux = mysql_field_name($result, $i);
        $out .= "<th>".$aux."</th>";
    }
    while ($linea = mysql_fetch_array($result, MYSQL_ASSOC)) {
        $out .= "<tr>";
        foreach ($linea as $valor_col) $out .= '<td>'.$valor_col.'</td>';
        $out .= "</tr>";
    }
    $out .= "</table>";
    return $out;
}