[superfish] Open/Close menu by mouseclick

[superfish] Open/Close menu by mouseclick

How can I set superfish plugin to open a submenu clicking (and not by mouseover) and leave it open?
Only clicking again on menu, the submenu closes.

tnx

P.S.
I'm using "nav-bar style" http://users.tpg.com.au/j_birch/plugins/superfish/#sample4