.htaccess question

hi guys I was wondering if there is a way for me to accomplish this with just .htaccess file
i want to redirect my website www.mywebsite.com/folder to www.mywebsite.com

I am using joomla as main site however I also use open source gallery which resides in .com/folder so when i go to .com/folder it opens my gallery but I want to somehow to redirect the whole gallery to .com/mygallery where ‘mygallery’ is same as .com/folder

basically i use joomla’s wrapper to include my gallery from.com/folder

thanks for any advice