[Plugin: JQuery Accordion Menu Widget] Page refreshers when you select menu item

I am using the WP E-commerce shopping cart and I want a vertical accordian menu for my product categories. I have installed this widget and it works until you click to make the menu selection. At that point the submenu appears then the page refereshes and then the sub menu has gone again.

http://wordpress.org/extend/plugins/jquery-vertical-accordion-menu/