var ThemeStructureManipulator = {
    addHouseTopImage: function() {
        var container = p$('mainContentCol');
        if ( container ) {
            var divImg = createElement('div');
            Element.addClassName(divImg, 'bfHouseTop');
            container.appendChild(divImg);
        }
    },
    
    initialize: function() {
        this.addHouseTopImage();
    }
}
Event.observe(window, 'load', ThemeStructureManipulator.initialize.bind(ThemeStructureManipulator), false);