(function () {
	var	d = document,
		iD = 'getElementById',
		cN = 'className',
		viewer = d[iD]('viewer'),
		brands = d[iD]('brands'),
		b_left = d[iD]('brands_left'),
		b_right = d[iD]('brands_right');
	
		b_left.onclick = function () {
			brands[cN] = 'left';
			b_left[cN] = 'disabled';
			b_right[cN] = '';
			b_left.blur();
		}
		b_right.onclick = function () {
			brands[cN] = 'right';
			b_right[cN] = 'disabled';
			b_left[cN] = '';
			b_right.blur();
		}
})();