diff -u a/mdwn_itex.pm b/mdwn_itex.pm
--- a/mdwn_itex.pm	2010-09-29 17:30:37.000000000 -0400
+++ b/mdwn_itex.pm	2010-09-29 23:59:59.713046023 -0400
@@ -2,66 +2,70 @@
 #
 # itex to MathML plugin for IkiWiki.  Based on the itex MovableType
 # plugin by Jacques Distler.
-#
-# Jason Blevins <jrblevin@sdf.lonestar.org>
-# Chapel Hill, March 16, 2008
 
 package IkiWiki::Plugin::mdwn_itex;
 
 use warnings;
 use strict;
-use IkiWiki 2.00;
+use IkiWiki 3.00;
 
 use File::Temp qw(tempfile);
 
-my $markdown_sub;
-my %itex_pages;
-
 sub import {
-    hook(type => "getopt", id => "mdwn_itex", call => \&getopt);
-    hook(type => "htmlize", id => "mdwn", call => \&htmlize);
-    hook(type => "preprocess", id => "itex", call => \&preprocess_itex);
-}
-
-sub getopt () {
-    eval q{use Getopt::Long};
-    error($@) if $@;
-    Getopt::Long::Configure('pass_through');
-    GetOptions(
-        # Location of the itex2mml binary
-        "itex2mml=s" => \$config{itex2mml},
-        # Enable or disable numbering of \[..\] equations
-        "itex_num_equations!" => \$config{num_equations},
-        # Process all pages by default or require [[!itex ]] directive?
-        "itex_default!" => \$config{itex_default},
-    );
-
-    # Default settings
-    $config{itex2mml} = '/usr/local/bin/itex2MML' unless defined $config{itex2mml};
-    $config{itex_num_equations} = 1 unless defined $config{itex_num_equations};
-    $config{itex_default} = 0 unless defined $config{itex_default};
-}
-
-sub preprocess_itex (@) {
-    my %params = @_;
-    if (defined $params{disable}) {
-        $itex_pages{$params{page}} = 0;
-    } else {
-        $itex_pages{$params{page}} = 1;
+    # register the plugin
+    hook(type => "getsetup", id => "mdwn_itex", call => \&getsetup);
+    hook(type => "checkconfig", id => "mdwn_itex", call => \&checkconfig);
+    hook(type => "preprocess", id => "itex", call => \&preprocess);
+    hook(type => "htmlize", id => "mdwn_itex", call => \&htmlize,
+	 longname => "Markdown + itex");
+}
+
+sub getsetup () {
+    # declare plugin options etc. for the setup file
+    return
+	plugin => {
+	    description => "itex to MathML conversion followed by Markdown formatting",
+	    safe => 1,
+	    rebuild => 1,
+	    section => "format",
+        },
+        itex2mml => {
+	    type => "string",
+	    example => '/usr/local/bin/itex2MML',
+	    description => "path to the itex2MML binary",
+	    safe => 0, # path
+	    rebuild => 0,
+	},
+        itex_num_equations => {
+	    type => "boolean",
+	    example => 1,
+	    description => "autonumber \[..\] equations?",
+	    safe => 1,
+	    rebuild => 1,
+	},
+}
+
+sub checkconfig () {
+    # setup default settings
+    if (! exists $config{itex2mml}) {
+	$config{itex2mml} = '/usr/local/bin/itex2MML';
+    }
+    if (! exists $config{itex_num_equations}) {
+	$config{itex_num_equations} = 1;
+    }
+    if (! exists $config{itex_default}) {
+	$config{itex_default} = 0;
     }
-    return '';
 }
 
-# Taken from mdwn plugin and modified to call itex2MML.
 sub htmlize (@) {
+    # convert the page contents to XHTML.
     my %params=@_;
+
     my $content = $params{content};
     my $page = $params{page};
 
-    # Default settings
-    $itex_pages{$page} = $config{itex_default} unless defined $itex_pages{$page};
-
-    $params{content} = itex_filter($content) if $itex_pages{$page};
+    $params{content} = itex_filter($content);
 
     return IkiWiki::Plugin::mdwn::htmlize(%params);
 }
@@ -77,6 +81,7 @@
 
     my ($Reader, $outfile) = tempfile( UNLINK => 1 );
     my ($Writer, $infile) = tempfile( UNLINK => 1 );
+    binmode $Writer, ":utf8";
     print $Writer "$content";
     system("$config{itex2mml} < $infile > $outfile");
     my @out = <$Reader>;
@@ -136,6 +141,9 @@
 
 =head1 AUTHORS
 
+W. Trevor King <wking@drexel.edu>,
+updates to IkiWiki v3.00
+
 Jason Blevins <jrblevin@sdf.lonestar.org>,
 itex Blosxom plugin
 
@@ -144,6 +152,12 @@
 
 =head1 SEE ALSO
 
+W. Trevor King's blog entry for this plugin:
+http://www.physics.drexel.edu/~wking/unfolding-disasters/posts/mdwn_itex/
+
+Jason Blevins' ikiwiki plugin:
+http://jblevins.org/git/ikiwiki/plugins.git/plain/mdwn_itex.pm
+
 ikiwiki Homepage:
 http://ikiwiki.info/
 
@@ -155,6 +169,8 @@
 
 =head1 LICENSE
 
+Copyright (C) 2010 W. Trevor King
+
 Copyright (C) 2008 Jason Blevins
 
 Copyright (C) 2003-2007 Jacques Distler