if (@txpinterface == 'admin') {
	register_callback("smd_browse_by_image", "image");
	register_callback("smd_browse_by_article", "list");
	register_callback("smd_browse_by_file", "file");
	register_callback("smd_browse_by_link", "link");
}

function smd_browse_by_image($evt, $stp) {
	$smd_browse_by_form = form(smd_browse_dropdown('image', $evt), '', '', 'get');
	smd_browse_by_js($smd_browse_by_form);
}

function smd_browse_by_article($evt, $stp) {
	$smd_browse_by_form = form(smd_browse_dropdown('article_cat', $evt), '', '', 'get')
		.form(smd_browse_dropdown('article_sec', $evt), '', '', 'get');
	smd_browse_by_js($smd_browse_by_form);
}

function smd_browse_by_file($evt, $stp) {
	$smd_browse_by_form = form(smd_browse_dropdown('file', $evt), '', '', 'get');
	smd_browse_by_js($smd_browse_by_form);
}

function smd_browse_by_link($evt, $stp) {
	$smd_browse_by_form = form(smd_browse_dropdown('link', $evt), '', '', 'get');
	smd_browse_by_js($smd_browse_by_form);
}

// Common js to place each 'browse by' above each area's search form
function smd_browse_by_js($content) {
	$out = doSlash($content);
	$js = <<<EOC
<script type="text/javascript">
	jQuery(document).ready(function() {
		jQuery(".search-form").before('<div class="smd_browse_by">{$out}</div>');
	});
</script>
<style type="text/css">
.smd_browse_by {
	width:100%;
	text-align:center;
}
.smd_browse_by form {
	display:inline;
}
</style>
EOC;
	echo $js;
}

function smd_browse_dropdown($type, $evt) {
	$browsable = array(
		'article_cat' => array(
			'by'    => smd_browse_by_gTxt('by_cat'),
			'table' => 'txp_category',
			'where' => "type = 'article' AND name != 'root'",
			'step'  => 'list',
			'meth'  => 'categories',
		),
		'article_sec' => array(
			'by'    => smd_browse_by_gTxt('by_sec'),
			'table' => 'txp_section',
			'where' => "name != 'default'",
			'step'  => 'list',
			'meth'  => 'section',
		),
		'image' => array(
			'by'    => smd_browse_by_gTxt('by_cat'),
			'table' => 'txp_category',
			'where' => "type = 'image' AND name != 'root'",
			'step'  => 'image_list',
			'meth'  => 'category',
		),
		'file' => array(
			'by'    => smd_browse_by_gTxt('by_cat'),
			'table' => 'txp_category',
			'where' => "type = 'file' AND name != 'root'",
			'step'  => 'file_list',
			'meth'  => 'category',
		),
		'link' => array(
			'by'    => smd_browse_by_gTxt('by_cat'),
			'table' => 'txp_category',
			'where' => "type = 'link' AND name != 'root'",
			'step'  => 'link_edit',
			'meth'  => 'category',
		),
	);

	if (isset($browsable[$type])) {
		$entry = $browsable[$type];
		$section_cat = safe_rows('name, title', $entry['table'], $entry['where']);
		$sel = array();
		foreach ($section_cat as $row) {
			$sel[$row['name']] = $row['title'];
		}
		if ($sel) {
			$use_go = get_pref('smd_browse_by_go_button', 0);
			return
				$entry['by'] . sp
				. selectInput('crit', $sel, gps('crit'), true, (($use_go) ? false : true) )
				. (($use_go) ? fInput('submit', '', gTxt('go'), 'smallerbox') : '')
				. hInput('event', $evt)
				. hInput('step', $entry['step'])
				. hInput('search_method', $entry['meth']);
		}
	}
	return false;
}

// ------------------------
// Plugin-specific replacement strings - localise as required
function smd_browse_by_gTxt($what, $atts = array()) {
	$lang = array(
		'by_cat' => 'Browse by Category:',
		'by_sec' => 'Browse by Section:',
	);
	return strtr($lang[$what], $atts);
}