installation instructions for joomla?

[RobWG]

I an trying to add adaptive-images to a joomla installation.
I try to follow the installation instructions.
It says I should look for a .htaccess file.
In the joomla/htdocs directory there is already a htaccess.txt file.
Should I add the .htaccess file in that directory or combine the two files?
Should I create the ai-cache directory manually in the joomla/htdocs directory ?
When I did this, no subdirs where created inside the ai-cache directory when I opened the site from a smartphone. I added the script in the of the HTML pages.
Thanks for any help.

[k3v3n]

** Notez que je serai absent du bureau du 7 au 11 juillet 2014. Je répondrai à mes courriels moins rapidement qu'à l'habitude. Pour une urgence, veuillez me laisser un message sur ma boîte vocale afin que je communique avec vous le plus rapidement.

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Keven Marin, Directeur des solutions web
Collectiv - Agence de publicité

+1 888 959-6352 x102 | www.collectiv.ca

[ConfidantCommunications]

Try installing this plugin: http://www.extly.com/docs/xt-adaptive_images