Make Menu Default to Open

I have the free version of Gridsby for a personal website http://www.nyc-railroad.com. I was wondering if there is a way I can make the left menu default to open instead of close. I like the layout of the menu and the option to collapse it, but when people go to another page on my site, I want the menu open unless they want to close it themselves.