function change_brand(obj){
	for (var i = 1; i <= 37; i++){
		if (document.getElementById('brand' + i) != null){
			document.getElementById('brand' + i).style.display = 'none';
		}
	}
	if (document.getElementById('brand' + obj) != null){
		document.getElementById('brand' + obj).style.display = 'block';
	}
}