public function renderStyleSheetFiles($writer)
{
$str = '';
foreach ($this->_styleSheetFiles as $url) {
if (is_array($url)) {
$str .= "<link rel=\"stylesheet\" type=\"text/css\" media=\"{$url[1]}\" href=\"" . THttpUtility::htmlEncode($url[0]) . "\" />\n";
} else {
$str .= "<link rel=\"stylesheet\" type=\"text/css\" href=\"" . THttpUtility::htmlEncode($url) . "\" />\n";
}
}
$writer->write($str);
}