Added attributes into <html> of userguide for valid html.
diff --git a/user_guide/general/alternative_php.html b/user_guide/general/alternative_php.html
index a91af15..3446b26 100644
--- a/user_guide/general/alternative_php.html
+++ b/user_guide/general/alternative_php.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Alternate PHP Syntax for View Files</title>
diff --git a/user_guide/general/ancillary_classes.html b/user_guide/general/ancillary_classes.html
index 148850e..daf5fb6 100644
--- a/user_guide/general/ancillary_classes.html
+++ b/user_guide/general/ancillary_classes.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Creating Ancillary Classes</title>
diff --git a/user_guide/general/autoloader.html b/user_guide/general/autoloader.html
index 8d000a9..8cf8919 100644
--- a/user_guide/general/autoloader.html
+++ b/user_guide/general/autoloader.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Auto-loading Resources</title>
diff --git a/user_guide/general/caching.html b/user_guide/general/caching.html
index 5cf8116..ecf0653 100644
--- a/user_guide/general/caching.html
+++ b/user_guide/general/caching.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Web Page Caching</title>
diff --git a/user_guide/general/controllers.html b/user_guide/general/controllers.html
index 3b25087..cd11eb1 100644
--- a/user_guide/general/controllers.html
+++ b/user_guide/general/controllers.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Controllers</title>
diff --git a/user_guide/general/core_classes.html b/user_guide/general/core_classes.html
index 9ba027c..c8117b9 100644
--- a/user_guide/general/core_classes.html
+++ b/user_guide/general/core_classes.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Creating Core System Classes</title>
diff --git a/user_guide/general/creating_libraries.html b/user_guide/general/creating_libraries.html
index 38ad107..370f1d4 100644
--- a/user_guide/general/creating_libraries.html
+++ b/user_guide/general/creating_libraries.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Creating Libraries</title>
diff --git a/user_guide/general/credits.html b/user_guide/general/credits.html
index eb1d4b8..04f9475 100644
--- a/user_guide/general/credits.html
+++ b/user_guide/general/credits.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Credits</title>
diff --git a/user_guide/general/errors.html b/user_guide/general/errors.html
index 4db0c4d..a3baf69 100644
--- a/user_guide/general/errors.html
+++ b/user_guide/general/errors.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Error Handling</title>
diff --git a/user_guide/general/helpers.html b/user_guide/general/helpers.html
index 65e549c..f4e607f 100644
--- a/user_guide/general/helpers.html
+++ b/user_guide/general/helpers.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Helper Functions</title>
diff --git a/user_guide/general/hooks.html b/user_guide/general/hooks.html
index 0441aca..63bf4be 100644
--- a/user_guide/general/hooks.html
+++ b/user_guide/general/hooks.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Hooks</title>
diff --git a/user_guide/general/index.html b/user_guide/general/index.html
index a220042..f7cb9e8 100644
--- a/user_guide/general/index.html
+++ b/user_guide/general/index.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Getting Started With CodeIgniter</title>
diff --git a/user_guide/general/libraries.html b/user_guide/general/libraries.html
index 3ae4c58..a9d3703 100644
--- a/user_guide/general/libraries.html
+++ b/user_guide/general/libraries.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Using CodeIgniter Libraries</title>
diff --git a/user_guide/general/managing_apps.html b/user_guide/general/managing_apps.html
index 3cc899e..7b0613b 100644
--- a/user_guide/general/managing_apps.html
+++ b/user_guide/general/managing_apps.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Managing your Applications</title>
diff --git a/user_guide/general/models.html b/user_guide/general/models.html
index 3164669..9a672ff 100644
--- a/user_guide/general/models.html
+++ b/user_guide/general/models.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Models</title>
diff --git a/user_guide/general/plugins.html b/user_guide/general/plugins.html
index a34f368..2027289 100644
--- a/user_guide/general/plugins.html
+++ b/user_guide/general/plugins.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Plugins</title>
diff --git a/user_guide/general/profiling.html b/user_guide/general/profiling.html
index f9c937d..adb1684 100644
--- a/user_guide/general/profiling.html
+++ b/user_guide/general/profiling.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Profiling Your Application</title>
diff --git a/user_guide/general/quick_reference.html b/user_guide/general/quick_reference.html
index 9dd9e9e..7ac2938 100644
--- a/user_guide/general/quick_reference.html
+++ b/user_guide/general/quick_reference.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Quick Reference Chart</title>
diff --git a/user_guide/general/requirements.html b/user_guide/general/requirements.html
index df63b91..9acbd57 100644
--- a/user_guide/general/requirements.html
+++ b/user_guide/general/requirements.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Server Requirements</title>
diff --git a/user_guide/general/routing.html b/user_guide/general/routing.html
index 9b29c3f..ce1700b 100644
--- a/user_guide/general/routing.html
+++ b/user_guide/general/routing.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : URI Routing</title>
diff --git a/user_guide/general/scaffolding.html b/user_guide/general/scaffolding.html
index 27ee209..cb4eceb 100644
--- a/user_guide/general/scaffolding.html
+++ b/user_guide/general/scaffolding.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Scaffolding</title>
diff --git a/user_guide/general/security.html b/user_guide/general/security.html
index 9a48c7e..0dd1f1f 100644
--- a/user_guide/general/security.html
+++ b/user_guide/general/security.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Security</title>
diff --git a/user_guide/general/urls.html b/user_guide/general/urls.html
index f3a01e5..a3389de 100644
--- a/user_guide/general/urls.html
+++ b/user_guide/general/urls.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : CodeIgniter URLs</title>
diff --git a/user_guide/general/views.html b/user_guide/general/views.html
index 5ad9fc5..e41503f 100644
--- a/user_guide/general/views.html
+++ b/user_guide/general/views.html
@@ -1,5 +1,5 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>CodeIgniter User Guide : Views</title>