var img_base = 'http://kakudai.biz/';

function rovb(obj)
{
	str = obj.src;
	ret = str.match(/(\d+)/g);
	obj.src = img_base + 'common/img/btn_b_' + ret[0] + '.jpg';
}

function roub(obj)
{
	str = obj.src;
	ret = str.match(/(\d+)/g);
	obj.src = img_base + 'common/img/btn_a_' + ret[0] + '.jpg';
}