$geshi->set_header_type(GESHI_HEADER_PRE_TABLE);
//$geshi->set_header_type(GESHI_HEADER_NONE);
//===
// Select the line number method
if ($lineNumbers == "true") {
    $geshi->enable_line_numbers(GESHI_NORMAL_LINE_NUMBERS);
    //$geshi->enable_line_numbers(GESHI_FANCY_LINE_NUMBERS, 5);
} else {
    $geshi->enable_line_numbers(GESHI_NO_LINE_NUMBERS);
}
//===
// Set where to start counting line numbers from
$geshi->start_line_numbers_at((int) $startLine);
//===
// Set the tab processing (only used for non-pre header types)
$geshi->set_use_language_tab_width(true);
$geshi->set_tab_width(4);
//===
// Set the base styles
initGeshiStyles($geshi);
//===
// Set the header and footer
// Note: As of this moment the footer doesn't seem to work right with the table
//       output format so we are leaving it empty.
$geshi->set_header_content($codeHeader);
$geshi->set_footer_content('');
//===
// Process the code
$highlightedCode = $geshi->parse_code();
//===
// Note: The old InsertCode plugin did some extra adjustments to the output string