Event.observe(document, 'dom:loaded', function() {
	var resizeHr = function() {
		var item = $('header');
		if(!item)	return;
		var width = item.offsetWidth + 'px';
		$A(document.getElementsByClassName('horizontal-division')).each( function(element) {
			Element.setStyle(element, { width: width } );
		} );
	}
	Event.observe(window, 'resize', resizeHr);
	resizeHr();
} );