function wmd_create(placement) {
    var edit = document.createElement('textarea');
    $(edit).addClass('editor');
    placement(edit);
    var preview = document.createElement('div');
    $(preview).addClass('preview');
    var panes = {
        input:      edit,
        preview:    preview,
        output:     null
    };
    var manager = new Attacklab.wmd.previewManager(panes);
    var editor = new Attacklab.wmd.editor(edit, manager.refresh);
    return {
        textarea:   edit,
        preview:    preview,
        editor:     editor,
        manager:    manager
    };
}

function wmd_remove(wmd) {
    wmd.manager.destroy();
    wmd.editor.destroy();
    $(wmd.textarea).remove();
    $(wmd.preview).remove();
}