non www to www redirect - Joomla! Forum - community, help and support

i have seen similar questions , tried different things, seems doesn't work me.

here .htacess code:

code: select all

##
# @version $id: htaccess.txt 14401 2010-01-26 14:10:00z louis $
# @package joomla
# @copyright copyright (c) 2005 - 2010 open source matters. rights reserved.
# @license http://www.gnu.org/copyleft/gpl.html gnu/gpl
# joomla! free software
##


#####################################################
#  read if choose use file
#
# line below section: 'options +followsymlinks' may cause problems
# server configurations.  required use of mod_rewrite, may already
# set server administrator in way dissallows changing in
# .htaccess file.  if using causes server error out, comment out (add # to
# beginning of line), reload site in browser , test sef url's.  if work,
# has been set server administrator , not need set here.
#
#####################################################

##  can commented out if causes errors, see notes above.
options +followsymlinks

#
#  mod_rewrite in use

rewriteengine on

########## begin - rewrite rules block out common exploits
## if experience problems on site block out operations listed below
## attempts block common type of exploit `attempts` joomla!
#
## deny access extension xml files (uncomment out activate)
#<files ~ "\.xml$">
#order allow,deny
#deny all
#satisfy all
#</files>
## end of deny access extension xml files
rewritecond %{query_string} mosconfig_[a-za-z_]{1,21}(=|\%3d) [or]
# block out script trying base64_encode crap send via url
rewritecond %{query_string} base64_encode.*\(.*\) [or]
# block out script includes <script> tag in url
rewritecond %{query_string} (\<|%3c).*script.*(\>|%3e) [nc,or]
# block out script trying set php globals variable via url
rewritecond %{query_string} globals(=|\[|\%[0-9a-z]{0,2}) [or]
# block out script trying modify _request variable via url
rewritecond %{query_string} _request(=|\[|\%[0-9a-z]{0,2})
# send blocked request homepage 403 forbidden error!
rewriterule ^(.*)$ index.php [f,l]
#
########## end - rewrite rules block out common exploits

#  uncomment following line if webserver's url
#  not directly related physical file paths.
#  update joomla! directory (just / root)

# rewritebase /


########## begin - joomla! core sef section
#
rewritecond %{request_filename} !-f
rewritecond %{request_filename} !-d
rewritecond %{request_uri} !^/index.php
rewritecond %{request_uri} (/|\.php|\.html|\.htm|\.feed|\.pdf|\.raw|/[^.]*)$  [nc]
rewriterule (.*) index.php
rewriterule .* - [e=http_authorization:%{http:authorization},l]
#
########## end - joomla! core sef section

## redirect non-www url's www url's
rewritecond %{http_host} ^deskandarchive\.com [nc]
rewriterule ^(.*)$ http://www.deskandarchive.com/$1 [l,r=301]



obiously, site http://www.deskandarchive.com , if helps...

review of discussion http://forum.joomla.org/viewtopic.php?f=428&t=443004 of help.