window.addEvent('domready',function(){
	$$('div.obr').each(function(element){
		element.getParent().addEvents({
			'mouseenter':function(){
				this.getElements('div.obr')[0].setStyles({'background-position': 'bottom left'});
			},
			'mouseleave':function(){
				this.getElements('div.obr')[0].setStyles({'background-position': ''});
			}
		});
	});
});