function loadSubmenu(id) {

	var item1 = 'sub_navi_' + id;
	var item2 = 'main_navi_' + id;
	hideAll();
	document.getElementById(item1).style.display = 'block';
	document.getElementById(item2).style.color = '#FFFFFF';
}

function hideAll() {

	document.getElementById('sub_navi_1').style.display = 'none';
	document.getElementById('sub_navi_2').style.display = 'none';
	document.getElementById('sub_navi_3').style.display = 'none';
	document.getElementById('sub_navi_4').style.display = 'none';
	document.getElementById('sub_navi_5').style.display = 'none';
	document.getElementById('sub_navi_6').style.display = 'none';

	document.getElementById('main_navi_1').style.color = 'black';
	document.getElementById('main_navi_2').style.color = 'black';
	document.getElementById('main_navi_3').style.color = 'black';
	document.getElementById('main_navi_4').style.color = 'black';
	document.getElementById('main_navi_5').style.color = 'black';
	document.getElementById('main_navi_6').style.color = 'black';
}