function doAct(s){
var t = document.getElementById('kf'),
c = s.className;
if(c != null && c.indexOf(' ') > -1){
s.className = c.replace(' ', '');
t.className = t.className.replace(' close', '');
}else{
s.className = c + ' ';
t.className = t.className + ' close';
}
}
