Hide thing

    // ***************************************
    // Auto hide (courtesy of Xd1358)
    // ***************************************

    function addHideButtons() {
            var hidables = getElementsByClass( 'hidable' );

            for( var i = 0; i < hidables.length; i++ ) {
                    var box = hidables[i];
                    var button = getElementsByClass( 'hidable-button', box, 'span' );

                    if( button != null && button.length > 0 ) {
                            button = button[0];

                            button.onclick = toggleHidable;
                            button.appendChild( document.createTextNode( '[Hide]' ) );

                            if( new ClassTester( 'start-hidden' ).isMatch( box ) ) {
                                    button.onclick( 'bypass' );
                            }
                    }
            }
    }

    function toggleHidable() {
            var parent = getParentByClass( 'hidable', this );
            var content = getElementsByClass( 'hidable-content', parent );
            var nowShown;

            if( content != null && content.length > 0 ) {
                    content = content[0];

                    if( content.style.display == 'none' ) {
                            content.style.display = content.oldDisplayStyle;
                            this.firstChild.nodeValue = '[Hide]';
                            nowShown = true;
                    } else {
                            content.oldDisplayStyle = content.style.display;
                            content.style.display = 'none';
                            this.firstChild.nodeValue = '[Show]';
                            nowShown = false;
                    }
            }
    }

function getElementsByClass( searchClass, node, tag ) {
    var classElements = new Array();

    if( node == null ) {
        node = document;
    }

    if( tag == null ) {
        tag = '*';
    }

    var els = node.getElementsByTagName( tag );
    var elsLen = els.length;
    var tester = new ClassTester( searchClass );

    for( i = 0, j = 0; i < elsLen; i++ ) {
        if( tester.isMatch( els[i] ) ) {
            classElements[j] = els[i];
            j++;
        }
    }

    return classElements;
}

function getParentByClass( className, element ) {
    var tester = new ClassTester( className );
    var node = element.parentNode;

    while( node != null && node != document ) {
        if( tester.isMatch( node ) ) {
            return node;
        }

        node = node.parentNode;
    }

    return null;
}

function ClassTester( className ) {
    this.regex = new RegExp( "(^|\\s)" + className + "(\\s|$)" );
}

ClassTester.prototype.isMatch = function( element ) {
    return this.regex.test( element.className );
}