added url_title function to HTML class

@@ -265,6 +265,48 @@ function form_linked_dropdown($name = '', $parent = '', $options = array(), $par
     return $form;
 }
 
+if ( ! function_exists('url_title'))
+{
+	function url_title($str, $separator = 'dash', $lowercase = FALSE)
+	{
+		if ($separator == 'dash')
+		{
+			$search		= '_';
+			$replace	= '-';
+		}
+		else
+		{
+			$search		= '-';
+			$replace	= '_';
+		}
+
+		$trans = array(
+						'&\#\d+?;'				=> '',
+						'&\S+?;'				=> '',
+						'\s+'					=> $replace,
+						'[^a-z0-9\-\._]'		=> '',
+						$replace.'+'			=> $replace,
+						$replace.'$'			=> $replace,
+						'^'.$replace			=> $replace,
+						'\.+$'					=> ''
+					);
+
+		$str = strip_tags($str);
+
+		foreach ($trans as $key => $val)
+		{
+			$str = preg_replace("#".$key."#i", $val, $str);
+		}
+
+		if ($lowercase === TRUE)
+		{
+			$str = strtolower($str);
+		}
+
+		return trim(stripslashes($str));
+	}
+}
+
 class Vars {
 
     public static $prefixes = Array(