diff --git a/src/ID3/ExtendedHeader.php b/src/ID3/ExtendedHeader.php
index 9b6dd78..dc54a42 100644
--- a/src/ID3/ExtendedHeader.php
+++ b/src/ID3/ExtendedHeader.php
@@ -117,7 +117,7 @@ final class ID3_ExtendedHeader extends ID3_Object
     $this->_size = $this->decodeSynchsafe32($this->_reader->readUInt32BE());
     
     /* ID3v2.3.0 ExtendedHeader */
-    if (isset($this->_options["version"]) && $this->_options["version"] < 4) {
+    if ($this->getOption("version", 4) < 4) {
       if ($this->_reader->readUInt16BE() == 0x8000)
         $this->_flags = self::CRC32;
       $this->_padding = $this->_reader->readUInt32BE();
@@ -299,7 +299,7 @@ final class ID3_ExtendedHeader extends ID3_Object
   public function __toString()
   {
     /* ID3v2.3.0 ExtendedHeader */
-    if (isset($this->_options["version"]) && $this->_options["version"] < 4) {
+    if ($this->getOption("version", 4) < 4) {
       return Transform::toUInt32BE($this->_size) .
         Transform::toUInt16BE($this->hasFlag(self::CRC32) ? 0x8000 : 0) .
         Transform::toUInt32BE($this->_padding) .
diff --git a/src/ID3/Frame.php b/src/ID3/Frame.php
index 739bf58..065fb36 100644
--- a/src/ID3/Frame.php
+++ b/src/ID3/Frame.php
@@ -152,7 +152,7 @@ class ID3_Frame extends ID3_Object
       $this->_size = $this->decodeSynchsafe32($this->_reader->readUInt32BE());
 
       /* ID3v2.3.0 Flags; convert to 2.4.0 format */
-      if (isset($this->_options["version"]) && $this->_options["version"] < 4) {
+      if ($this->getOption("version", 4) < 4) {
         $flags = $this->_reader->readUInt16BE();
         if (($flags & 0x8000) == 0x8000)
           $this->_flags |= self::DISCARD_ON_TAGCHANGE;
@@ -243,7 +243,7 @@ class ID3_Frame extends ID3_Object
   public function __toString()
   {
     /* ID3v2.3.0 Flags; convert from 2.4.0 format */
-    if (isset($this->_options["version"]) && $this->_options["version"] < 4) {
+    if ($this->getOption("version", 4) < 4) {
       $flags = 0;
       if ($this->hasFlag(self::DISCARD_ON_TAGCHANGE))
         $flags = $flags | 0x8000;
diff --git a/src/ID3/Header.php b/src/ID3/Header.php
index a703c24..589404c 100644
--- a/src/ID3/Header.php
+++ b/src/ID3/Header.php
@@ -119,7 +119,7 @@ final class ID3_Header extends ID3_Object
    */
   public function setVersion($version)
   {
-    $this->_version = $this->_options["version"] = $version;
+    $this->setOption("version", $this->_version = $version);
   }
   
   /**
diff --git a/src/ID3/Object.php b/src/ID3/Object.php
index d96825e..3c3e894 100644
--- a/src/ID3/Object.php
+++ b/src/ID3/Object.php
@@ -59,7 +59,7 @@ abstract class ID3_Object
    *
    * @var Array
    */
-  protected $_options;
+  private $_options;
   
   /**
    * Constructs the class with given parameters and reads object related data
@@ -81,6 +81,20 @@ abstract class ID3_Object
    */
   public function getOptions() { return $this->_options; }
   
+  /**
+   * Returns the given option value, or the default value if the option is not
+   * defined.
+   *
+   * @param string $option The name of the option.
+   * @param mixed $defaultValue The default value to be returned.
+   */
+  public function getOption($option, $defaultValue = false)
+  {
+    if (isset($this->_options[$option]))
+      return $this->_options[$option];
+    return $defaultValue;
+  }
+  
   /**
    * Sets the options array. See {@link ID3v2} class for available options.
    *
@@ -88,6 +102,17 @@ abstract class ID3_Object
    */
   public function setOptions(&$options) { $this->_options = $options; }
   
+  /**
+   * Sets the given option the given value.
+   *
+   * @param string $option The name of the option.
+   * @param mixed $value The value to set for the option.
+   */
+  public function setOption($option, $value)
+  {
+    $this->_options[$option] = $value;
+  }
+  
   /**
    * Magic function so that $obj->value will work.
    *
diff --git a/src/ID3v2.php b/src/ID3v2.php
index 1483007..1af6e54 100644
--- a/src/ID3v2.php
+++ b/src/ID3v2.php
@@ -132,6 +132,8 @@ final class ID3v2
         throw new ID3_Exception
           ("File does not contain ID3v2 tag: " . $filename);
       
+      $startOffset = $this->_reader->getOffset();
+      
       $this->_header = new ID3_Header($this->_reader, $options);
       if ($this->_header->getVersion() < 3 || $this->_header->getVersion() > 4)
         throw new ID3_Exception
@@ -146,7 +148,7 @@ final class ID3v2
         $offset = $this->_reader->getOffset();
         
         // Jump off the loop if we reached the end of the tag
-        if ($offset - 10 >= $this->_header->getSize() -
+        if ($offset - $startOffset - 10 >= $this->_header->getSize() -
             ($this->hasFooter() ? 10 : 0))
           break;
         
@@ -337,9 +339,6 @@ final class ID3v2
    */
   public function write($filename = false)
   {
-    if (empty($this->_frames))
-      throw new ID3_Exception("Tag must contain at least one frame");
-    
     if ($filename === false && ($filename = $this->_filename) === false)
       throw new ID3_Exception("No file given to write the tag to");
     
@@ -349,9 +348,10 @@ final class ID3v2
     
     $oldTagSize = $this->_header->getSize();
     $tag = "" . $this;
-    $tagSize = strlen($tag);
+    $tagSize = empty($this->_frames) ? 0 : strlen($tag);
 
-    if ($this->_reader === null || $tagSize - 10 > $oldTagSize) {
+    if ($this->_reader === null ||
+        $tagSize - 10 > $oldTagSize || $tagSize == 0) {
       fseek($fd, 0, SEEK_END);
       $oldFileSize = ftell($fd);
       ftruncate($fd, $newFileSize = $tagSize - $oldTagSize + $oldFileSize);
@@ -363,7 +363,8 @@ final class ID3v2
       }
     }
     fseek($fd, 0);
-    fwrite($fd, $tag);
+    fwrite($fd, $tag, $tagLength);
+    fclose($fd);
 
     $this->_filename = $filename;
   }
@@ -393,6 +394,23 @@ final class ID3v2
     throw new ID3_Exception("Unknown frame/field: " . $name);
   }
   
+  /**
+   * Magic function so that isset($obj->value) will work. This method checks
+   * whether the frame matching the identifier exists.
+   *
+   * @param string $name The frame identifier.
+   * @return boolean
+   */
+  public function __isset($name) { return isset($this->_boxes[$name]); }
+  
+  /**
+   * Magic function so that unset($obj->value) will work. This method removes
+   * all the frames matching the identifier.
+   *
+   * @param string $name The frame identifier.
+   */
+  public function __unset($name) { unset($this->_boxes[$name]); }
+  
   /**
    * Returns the tag raw data.
    *
diff --git a/src/ISO14496/Box.php b/src/ISO14496/Box.php
index a1afffe..a78992c 100644
--- a/src/ISO14496/Box.php
+++ b/src/ISO14496/Box.php
@@ -263,7 +263,7 @@ class ISO14496_Box
       if ($size == 0)
         $size = $this->_reader->getSize() - $offset;
       
-      if (preg_match("/^\xa9?[a-z]{3,4}$/i", $type) &&
+      if (preg_match("/^\xa9?[a-z0-9]{3,4}$/i", $type) &&
           substr($base, 0, min(strlen($base), strlen
                                ($tmp = $path . ($path ? "." : "") . $type))) ==
           substr($tmp,  0, min(strlen($base), strlen($tmp))))
@@ -287,14 +287,6 @@ class ISO14496_Box
     array_pop(self::$_path);
   }
   
-  protected function getPath()
-  {
-    $path = "";
-    echo "box: " .$this->getType() . ", parent: " . $this->getParent()."\n";
-    for ($child = $this; ($parent = $child->getParent()) !== null; $child = $parent){echo "parent found";$path = $parent->getType() . "." . $path;};
-    return $path;
-  }
-  
   /**
    * Checks whether the box given as an argument is present in the file. Returns
    * <var>true</var> if one or more boxes are present, <var>false</var>
diff --git a/src/ISO14496/Box/ID32.php b/src/ISO14496/Box/ID32.php
index 7f1c44f..7c17394 100644
--- a/src/ISO14496/Box/ID32.php
+++ b/src/ISO14496/Box/ID32.php
@@ -124,8 +124,8 @@ final class ISO14496_Box_ID32 extends ISO14496_Box_Full
   {
     return parent::__toString
       (Transform::toUInt16BE
-       (((ord($language[0]) - 0x60) << 10) |
-        ((ord($language[1]) - 0x60) << 5) |
-          ord($language[2]) - 0x60) . $this->_tag);
+       (((ord($this->_language[0]) - 0x60) << 10) |
+        ((ord($this->_language[1]) - 0x60) << 5) |
+          ord($this->_language[2]) - 0x60) . $this->_tag);
   }
 }