What about a custom function?
var div = function(klass){return $(document.createElement('div')).addClass(klass)};
// HTML Tree
$this.append(
div('wood-bottom'),
div('jalendar-wood')
.append(
div('jalendar-pages')
.append(
div('pages-bottom'),
div('header'),
div('total-bar'),
div('days')
)
)
);