Switching two virtual host (configured with httpd.conf) using .htaccess

I have configured tow virtual host for two domains www.domain1.com and www.domain2.com:

<VirtualHost *>
    ServerName prod.domain.com
    ServerAlias www.domain1.com
    DocumentRoot /data/prod/web/
     DirectoryIndex index.php
     <Directory  "/data/pro开发者_开发知识库d/web">
           AllowOverride All
           Allow from All
     </Directory>
     Alias /sf /data/prod/lib/vendor/symfony/data/web/sf
     <Directory "/data/prod/lib/vendor/symfony/data/web/sf">
           AllowOverride All
           Allow from All
</VirtualHost>

<VirtualHost *>
    ServerName dev.domain.com
    ServerAlias www.domain2.com
    DocumentRoot /data/dev/web/
     DirectoryIndex index.php
     <Directory  "/data/dev/web">
           AllowOverride All
           Allow from All
     </Directory>
     Alias /sf /data/dev/lib/vendor/symfony/data/web/sf
     <Directory "/data/dev/lib/vendor/symfony/data/web/sf">
           AllowOverride All
           Allow from All
     </Directory>
</VirtualHost>

Now, I want with htaccess file to switch the folder pointing to the domain:

Before

/data/prod/web --> www.domain1.com

/data/dev/web --> www.domain2.com

After

/data/prod/web --> www.domain2.com

/data/dev/web --> www.domain1.com

Is it possible? could you help me ?

Thanks a lot

---

From the Apache documentation:

DocumentRoot Directive
Description: Directory that forms the main document tree visible from the web
Syntax: DocumentRoot directory-path
Default: DocumentRoot /usr/local/apache/htdocs
Context: server config, virtual host
Status: Core Module: core

Note what's in bold here...you cannot change the DocumentRoot from .htaccess files. Here is a list of all possible context values, FYI:

http://httpd.apache.org/docs/2.0/mod/directive-dict.html#Context