var left_lb_idx = 1;
function show_left_lb(idx) {
	left_lb_idx = idx;
	var left_lb = document.getElementById('left_lb');
	var data = document.getElementById('left_lb_' + left_lb_idx).innerHTML;
	left_lb.innerHTML = data;
}
function img_left_over(idx) {
	var img1 = document.getElementById('img_left_1');
	var img2 = document.getElementById('img_left_2');
	img1.src = '/images/tab_pho.gif';
	img2.src = '/images/tab_video.gif';
	switch(idx) {
	case 1:
		img1.src = '/images/tab_pho_over.gif';
		break;
	case 2:
		img2.src = '/images/tab_video_over.gif';
		break;
	}
}