treemanagement collapse all categories when on is open

[design1]

Hi everybody,

Im trying to change the menu tree. I want to be able to click on a category name, open that one(subcategories will appear) and then click to another category name (subcategories will appear) and the previous opened category should collapse.

Im working on the treemanagement file but cannot make it work:(

function toggleBranch(jQueryElement, noAnimation) {
   if(jQueryElement.hasClass('OPEN'))

       closeBranch(jQueryElement, noAnimation);

   else
       openBranch(jQueryElement, noAnimation);
}

Do you have ideas how I can do that?

Regards