Show hide children

I found a way here
http://mysitemyway.com/docs/index.php/Collapsible_sidebar_menus
To make the children items expand/collapse with show/hide, but when applied, the parent item no longer is a link to the page.

Does anyone have a alternative method to use show/hide and keep the anchor?

http://ww.wp.xz.cn/extend/plugins/section-subnav/