diff --git a/phpBB/develop/imageset_to_css.php b/phpBB/develop/imageset_to_css.php
new file mode 100644
index 0000000000..3d55808319
--- /dev/null
+++ b/phpBB/develop/imageset_to_css.php
@@ -0,0 +1,274 @@
+<?php
+
+/*
+	Converts imageset to CSS code
+	
+	Change style name and path below, open in browser.
+*/
+
+$phpbb_root_path = '../';
+$style = 'subsilver2';
+
+$imageset_path = $phpbb_root_path . 'styles/' . $style . '/imageset';
+$theme_path = $phpbb_root_path . 'styles/' . $style . '/theme2';
+
+// Start output buffering
+ob_start();
+
+// Get global and English images
+$images_global = get_imageset($imageset_path);
+if($images_global === false)
+{
+	echo 'imageset.cfg was not found.';
+	echo ob_get_clean();
+	return;
+}
+$images_en = get_imageset($imageset_path, 'en');
+if($images_en === false)
+{
+	echo 'English imageset.cfg was not found.';
+	echo ob_get_clean();
+	return;
+}
+
+// Remove duplicate images
+foreach($images_en as $key => $row)
+{
+	unset($images_global[$key]);
+}
+
+// CSS replacements
+$not_compatible = array(
+	'{T_TEMPLATE_PATH}',
+	'{T_IMAGESET_PATH}',
+	'{T_IMAGESET_LANG_PATH}',
+	'{T_STYLESHEET_NAME}',
+	'{S_USER_LANG}'
+);
+$replace = array(
+	'{T_THEME_PATH}'	=> '.',
+);
+// Enable/disable one of lines below to enable/disable replacement of English buttons
+// $replace = array_merge($replace, get_replacements($images_global));
+$replace = array_merge($replace, get_replacements($images_global), get_replacements($images_en));
+
+// Get all CSS files, parse them
+$files = list_files($theme_path, 'css');
+if($files === false || !count($files))
+{
+	echo 'No CSS files found in theme directory.<br />';
+}
+else for($i=0; $i<count($files); $i++)
+{
+	$file = $theme_path . '/' . $files[$i];
+	$data = file_get_contents($file);
+	$hash = md5($data);
+	$data = strtr($data, $replace);
+	$errors = false;
+	for($j=0; $j<count($not_compatible); $j++)
+	{
+		if(strpos($data, $not_compatible[$j]) !== false)
+		{
+			echo 'Error: ', $file, ' contains ', $not_compatible[$j], '. That variable cannot be converted.<br />';
+		}
+	}
+	if(md5($data) == $hash)
+	{
+		echo 'Nothing to replace in ', $file, '<br />';
+	}
+	else
+	{
+		echo 'Updated ', $file, ':', dump_code($data, $files[$i]);
+	}
+}
+
+// Check if there are invalid images in imageset
+$list = array_merge($images_global, $images_en);
+foreach($list as $key => $row)
+{
+	if($row['skip'])
+	{
+		echo 'Unable to generate code to add to CSS files because some images are missing or invalid. See errors above.';
+		echo ob_get_clean();
+		return;
+	}
+}
+
+// Code to add to CSS files
+$code = '
+/* Former imageset */
+span.imageset {
+	display: inline-block;
+	background: transparent none 0 0 no-repeat;
+	margin: 0;
+	padding: 0;
+	width: 0;
+	height: 0;
+	overflow: hidden;
+}
+
+/* Global imageset items */
+' . css($images_global, './images/') . '
+
+/* English images for fallback */
+' . css($images_en, './en/');
+echo 'Code to add to CSS file:', dump_code($code, 'imageset.css');
+
+$list = list_languages($imageset_path);
+for($i=0; $i<count($list); $i++)
+{
+	$lang = $list[$i];
+	$images = get_imageset($imageset_path . '/' . $lang);
+	if(!count($images)) continue;
+	$code = '/* ' . strtoupper($lang) . ' Language Pack */
+' . css($images, './');
+	echo 'New CSS file: ', $theme_path, '/', $lang, '/stylesheet.css', dump_code($code, 'stylesheet_' . $lang . '.css');
+}
+
+echo ob_get_clean();
+return;
+
+
+/*
+	Functions
+*/
+function get_imageset($path, $lang = '')
+{
+	$cfg = $path . ($lang ? '/' . $lang : '') . '/imageset.cfg';
+	if(!@file_exists($cfg)) return false;
+	$data = file($cfg);
+	$result = array();
+	for($i=0; $i<count($data); $i++)
+	{
+		$str = trim($data[$i]);
+		if(substr($str, 0, 4) != 'img_') continue;
+		$list = explode('=', $data[$i]);
+		if(count($list) != 2) continue;
+		$key = trim($list[0]);
+		$row = explode('*', trim($list[1]));
+		$file = trim($row[0]);
+		$height = isset($row[1]) && intval($row[1]) ? intval($row[1]) : false;
+		$width = isset($row[2]) && intval($row[2]) ? intval($row[2]) : false;
+		$skip = false;
+		if(strlen($file) && (!$width || !$height))
+		{
+			// Try to detect width/height
+			$filename = $path . ($lang ? '/' . $lang : '') . '/' . $file;
+			if(!@file_exists($filename))
+			{
+				echo 'Error: file ', $filename, ' does not exist and its dimensions are not available in imageset.cfg<br />';
+				$skip = true;
+			}
+			else
+			{
+				$size = @getimagesize($filename);
+				if($size === false)
+				{
+					echo 'Error: file ', $filename, ' is not a valid image<br />';
+					$skip = true;
+				}
+				else
+				{
+					if(!$width) $width = intval($size[0]);
+					if(!$height) $height = intval($size[1]);
+				}
+			}
+		}
+		$result[$key] = array(
+			'lang'  => $lang,
+			'file'  => $file,
+			'height'	=> $height,
+			'width' => $width,
+			'skip'  => $skip
+		);
+	}
+	return $result;
+}
+
+function get_replacements($list)
+{
+	$result = array();
+	foreach($list as $key => $row)
+	{
+		$key = '{' . strtoupper($key);
+		$result[$key . '_SRC}'] = strlen($row['file']) ? ($row['lang'] ? './' . $row['lang'] : './images') . '/' . $row['file'] : '';
+		$result[$key . '_WIDTH}'] = intval($row['width']);
+		$result[$key . '_HEIGHT}'] = intval($row['height']);
+	}
+	return $result;
+}
+
+function list_files($dir, $ext)
+{
+	$res = @opendir($dir);
+	if($res === false) return false;
+	$files = array();
+	while(($file = readdir($res)) !== false)
+	{
+		$list = explode('.', $file);
+		if(count($list) > 1 && strtolower($list[count($list) - 1]) == $ext)
+		{
+			$files[] = $file;
+		}
+	}
+	closedir($res);
+	return $files;
+}
+
+function list_languages($dir)
+{
+	$res = @opendir($dir);
+	if($res === false) return array();
+	$files = array();
+	while(($file = readdir($res)) !== false)
+	{
+		if(substr($file, 0, 1) == '.') continue;
+		$filename = $dir . '/' . $file;
+		if(is_dir($filename) && file_exists($filename . '/imageset.cfg'))
+		{
+			$files[] = $file;
+		}
+	}
+	closedir($res);
+	return $files;
+}
+
+function dump_code($code, $filename = 'file.txt')
+{
+	$hash = md5($code);
+	if(isset($_GET['download']) && $_GET['download'] === $hash)
+	{
+		// Download file
+		ob_end_clean();
+		header('Pragma: public');
+		header('Expires: 0');
+		header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
+		header('Content-Type: application/force-download');
+		header('Content-Disposition: attachment; filename="' . $filename . '";');
+		header('Content-Transfer-Encoding: binary');
+		header('Content-Length: ' . strlen($code));
+		echo $code;
+		exit;
+	}
+	$list = explode("\n", $code);
+	$height = 15 * count($list);
+	echo ' [ <a href="?download=', $hash, '">download</a> <a href="javascript:void(0);" onclick="document.getElementById(\'code-', $hash, '\').style.height = \'', $height, 'px\'; this.style.display = \'none\'; return false;">expand</a> ]<br />';
+	echo '<textarea id="code-', $hash, '" onfocus="this.select();" style="width: 98%; height: 200px;">', htmlspecialchars($code), '</textarea><br />';
+}
+
+function css($list, $path = './')
+{
+	$code = '';
+	foreach($list as $key => $row)
+	{
+		if(!strlen($row['file'])) continue;
+		$code .= '.imageset.' . substr($key, 4) . ' {
+	background-image: url("' . $path . $row['file'] . '");
+	padding-left: ' . $row['width'] . 'px;
+	padding-top: ' . $row['height'] . 'px;
+}
+';
+	}
+	return $code;
+}
+