Add a javascript cookie to save user selection

Hello, this is my site [login to view URL] The site is in arabic, but do not worry that won't be a problem. We can help you with that. We have 2 layouts: Grid and List layouts You can see the icons at the top left. The problem is if I change the layout and refresh, it will revert back to Grid since it is the default one. We would like to add some sort of a javascript cookie to save the user selection as long as the cookies live. We are not sure if this is the best method to achieve it but we are open to alternatives and suggestions. This is a 30 minutes job and needs to be done RIGHT NOW!