function toggle_info_operation_tab(number) {
	for (i=1;i <= 6; i++)	{
		src = 'img_info_tab' + i;
		img = '/cylearn2007/public/images/info/company_tap_'+i+'b.gif';
		$(src).src = img;
	}

	var id;
	id = 'img_info_tab' + number;
	$(id).src = $(id).src.replace(/b\.gif/, "a.gif");
}