i added the line to the css (s5_suckerfish.css) and no change where happened.
the site by default turns to RTL when the Arabic language selected as default language in the administrator.
check this copy of your demo site http://dostoormasr.info/
nothing been mad and no extension installed only Arabic has been set as the default language of the site.
I really need a solution, big effort has been but into this site and i cant launch it with the way it looks in Explorer.