genericish implementation of a block toggling script for Drupal

gistfile1.js

/**
 * @fileoverview, written for my own amusement, these few lines make a robust
 * replacement for the first 340ish lines found within the jQuery on ready 
 * handler in the main.js file on the new site. This is fine as a standalone,
 * but there are redundancies if this is used with the other scripts I've 
 * contributed to this project. If used, the duplication should be fixed.
 * @author Noah Feldman
 * updated 2011-08-22: removed superfluous semicolon 
 */
// PUT THIS IN THE `$(document).ready(function () {` IN main.js
// IN PLACE OF LINES 4 - 349
var sidebar = $('.share-block'),
    rBlacklist = /^(?:block-search_.+|.+-(5204|2634))$/, // blocks to not toggle, add tests as needed
    rStartClosed = /^\/patient-care\/(?:diagnoses-disorders\/.+|patient-care-programs\/outpatient-programs\/.+)/, // paths for pages to collapse the first two blocks on by default
    headings = [], sidebarToggler;

function toggler (toggles, toggleds, nodeName, show, hide) {
    var rTest, toggleClass = {}, u = void(0);
    // can be a string or an array
    nodeName = typeof nodeName == 'string' ? RegExp(nodeName, 'i') : RegExp('(?:' + nodeName.join('|') + ')', 'i');
    // should check for existence of just one or the other, as well...
    if (!show && !hide)
        ((show = 'show') && (hide = 'hide'));

    toggleClass[show] = hide;
    toggleClass[hide] = show;

    rTest = RegExp('(' + show + '|' + hide + ')');

    function indexOf (item, list) {        // cross-browser indexOf for anything
        if (!!list.indexOf)                // with a length. Is also used by menu
            return list.indexOf(item);     // highlight script, so should combine
        for (var i = 0, len = list.length; i < len; i++)
            if (list[i] === item) 
                return i;
        return -1;
    }

    return function (e, idx) {
    // if the event target has an expected nodeName
        if (e.target.nodeName && nodeName.test(e.target.nodeName)) {
            if (typeof idx != 'number')
                idx = indexOf(e.target, toggles);
            if (idx > -1) {
                toggles[idx].className = toggles[idx].className.replace(rTest, function (m) { 
                return toggleClass[m]; });
                toggleds.eq(idx).stop(true, true).slideToggle(333);
            }
        }
    }
}

// simple crossbrowser each function for anything with a length
function each (list, callback, thisObject) {
    for (var i = 0, len = list.length; i < len; i++)
        callback.call(thisObject, list[i], i);
}

if (sidebar[0]) {
    each(sidebar[0].getElementsByTagName('h2'), function(el, i) {
        if (el.parentNode && !rBlacklist.test(el.parentNode.id)) {
            el.className += ' show-block';
            return headings[i] = el;  // create a sparse array to keep sync 
        }                             // between toggleds and toggles indices 
    });

    sidebarToggler = toggler(headings, sidebar.find('h2 + .content'), 'h2');

    if (rStartClosed.test(location.pathname)) {
        sidebarToggler({target: {nodeName: 'h2'}}, 0); // start collapsed
        sidebarToggler({target: {nodeName: 'h2'}}, 1); // start collapsed
    }

    sidebar.bind('click', sidebarToggler);
}