Fetch Widget names for Javascript

I’ve got a bit of javascript to expand and collapse list items by id. I’m going into functions.php, and adding some code to the register_sidebar array to achieve this… Adding the link to call the javascript function is no problem, except the variable that should produce the widget id just outputs the string “%1$s”.

I need to call the function and pass it the name of the list item. The “%i$s” in ‘before_widget’ is converted into the widget name properly, the the %1$s in ‘before_title’ is ignored.

Is the %1$s handled by the code for the widget, or is it coming from WordPress itself? I don’t recognize the syntax, but I’m pretty new to this. My theme works fine, but I want to make it compatible with widgetized sidebars without losing any functionality.

php code from functions.php

if ( function_exists('register_sidebar') )
    register_sidebar(array(
        'before_widget' => '<li id="%1$s" class="widget %2$s"><ul>',
        'after_widget' => '</ul></li>',
        'before_title'=>'<a href="javascript:switchit(\'%1$s\')"><h2 class="widgettitle">',
        'after_title' => '</h2></a>',
    ));

javscript

function switchit(list){

   var listElementStyle=document.getElementById(list).style;
   if (listElementStyle.display=="none")
      listElementStyle.display="block";
   else
      listElementStyle.display="none";
}

Any help, or just a nudge in the right direction, is greatly appreciated!