function greenchange(num,obj) {
    var parton = getElementsByClassName('greenchange','parton');
    parton[0].className = 'part';
    obj.className = 'parton';
    for(i = 1; i < 4; i++) {
        document.getElementById('greenchange'+i+'').style.display='none';
    }
    document.getElementById('greenchange'+num+'').style.display='';
}

function cbg_on(obj)
{
    obj.style.backgroundColor='#fff6db';
}
function cbg_out(obj)
{
    obj.style.backgroundColor='';
}