diff --git a/lib/App/Model/Languages.pm b/lib/App/Model/Languages.pm
index 9332fc1..7354640 100644
--- a/lib/App/Model/Languages.pm
+++ b/lib/App/Model/Languages.pm
@@ -24,6 +24,11 @@ my @langs = (
     {name => "perl5.6",   mode => "perl", description => "Perl 5.6"},
     {name => "evalall",  mode => "perl", description => "Perl (EvalAll)"},
     {name => "perl5.5",   mode => "perl", description => "Perl 5.5"},
+    {name => "perl5.4",   mode => "perl", description => "Perl 5.004"},
+    {name => "perl5.3",   mode => "perl", description => "Perl 5.003"},
+    {name => "perl5.2",   mode => "perl", description => "Perl 5.002"},
+    {name => "perl5.1",   mode => "perl", description => "Perl 5.001"},
+    {name => "perl5.0",   mode => "perl", description => "Perl 5.000"},
     {name => "perl4",     mode => "perl", description => "Perl 4.0.36"},
     {name => "perl3",     mode => "perl", description => "Perl 3.0.1.10_44"},
     {name => "perl2",     mode => "perl", description => "Perl 2"},
diff --git a/templates/editor.html b/templates/editor.html
index fb4166b..8fe99a7 100755
--- a/templates/editor.html
+++ b/templates/editor.html
@@ -211,8 +211,8 @@
     //safely delete all bindings
     var save_keys={};
     Object.keys(editor.keyBinding.$defaultHandler.commandKeyBinding)
-        .filter((value) => value.match(/(?:(?:backspac|hom)e|d(?:elete|own)|(?:righ|lef)t|end|up)/))
-        .forEach((key) => save[key] = editor.keyBinding.$defaultHandler.commandKeyBinding[key]); 
+        .filter((value) => value.match(/(?:(?:backspac|hom)e|d(?:elete|own)|(?:righ|lef)t|end|up|tab)/))
+        .forEach((key) => save_keys[key] = editor.keyBinding.$defaultHandler.commandKeyBinding[key]); 
 
     editor.keyBinding.$defaultHandler.commandKeyBinding = save_keys;
 
diff --git a/templates/viewer.html b/templates/viewer.html
index 60f13f8..2f7fca2 100755
--- a/templates/viewer.html
+++ b/templates/viewer.html
@@ -125,6 +125,15 @@
     editor.setReadOnly(true);
     editor.setOptions({maxLines: Infinity});
     editor.getSession().setUseWrapMode(true);
+    
+    //safely delete all bindings
+    var save_keys={};
+    Object.keys(editor.keyBinding.$defaultHandler.commandKeyBinding)
+        .filter((value) => value.match(/(?:(?:backspac|hom)e|d(?:elete|own)|(?:righ|lef)t|end|up)/))
+        .forEach((key) => save_keys[key] = editor.keyBinding.$defaultHandler.commandKeyBinding[key]); 
+
+    editor.keyBinding.$defaultHandler.commandKeyBinding = save_keys;
+    
     /*function resizeAce() {
       var h = window.innerHeight;
       var ch = h - 400;