htaccess not redirecting properly with rewrite rules - .htaccess

Question

I'm trying to create a simple htaccess file that does the following:
Redirects all http://domain.com to http://www.domain.com
Allows the '.php' extension to be dropped from file names
Allows http://www.domain.com/page/var and http://www.domain.com/page/var/ to be seen as http://www.domain.com/page?u=var
Rewrites all http://www.domain.com/page?u=var to http://www.domain.com/page/var
This is what I have so far, but it doesn't seem to be working:
IndexIgnore .htaccess
DirectoryIndex index.php
Options -Indexes
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule (.*) http://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
RewriteRule ^([^/.]+)/?$ $1.php
RewriteRule page1/(.*)/$ /page1?u=$1
RewriteRule page1/(.*)$ /page1?u=$1
RewriteRule page2/(.*)/$ /page2?t=$1
RewriteRule page2/(.*)$ /page2?t=$1
ErrorDocument 400 http://www.domain.com/error?e=400
ErrorDocument 401 http://www.domain.com/error?e=401
ErrorDocument 403 http://www.domain.com/error?e=403
ErrorDocument 404 http://www.domain.com/error?e=404
ErrorDocument 500 http://www.domain.com/error?e=500
AddOutputFilterByType DEFLATE text/plain
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/xml
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE application/xml
AddOutputFilterByType DEFLATE application/xhtml+xml
AddOutputFilterByType DEFLATE application/rss+xml
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE application/x-javascript
Any help would be appreciated, thanks.

Answer 1

Try this :
IndexIgnore .htaccess
DirectoryIndex index.php
Options -Indexes
RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule (.*) http://www.%{HTTP_HOST}%{REQUEST_URI} [NE,R=301,L]
#Remove .php
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^([^.]+)/?$ /$1.php [L,NC]
RewriteCond %{THE_REQUEST} /page\?u=([^\s]+)
RewriteRule ^ /page/%1? [NE,R,L]
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/([^/]+)/?$ /page?u=$2 [L,NC]