求高手帮写一句JS代码，请看..
请高手帮忙写下面这个功能的JS代码：
要求：

<button type="button" class="active">点击我</button>
<input type="radio" style="display: none">

点点击button按钮的class值为active的时候，input自动赋予check属性，即

<input type="radio" style="display: none" check>

谢谢～～～
html
[解决办法]

<button type="button" class="btn btn-warning btn-primary memtype active" 
onclick='checkedRadio(this,"g_6");' data-toggle="button">企业</button>
<input type="radio" name="post[regid]" value="6" id="g_6" checked="true">
<button type="button" name="post[regid]" value="5" onclick='checkedRadio(this,"g_5");' class="btn btn-warning btn-primary memtype" data-toggle="button">个人</button>
<input type="radio" name="post[regid]" value="5" id="g_5">
<script type="text/javascript">
function checkedRadio(obj,_id){    
    var _cheched = hasClass(obj,'active');    
    if(!_cheched){        
        obj.className+=' active';
    }
    document.getElementById(_id).checked = true;
}
function hasClass(obj , _class){
    var _classes = obj.className.split(' ');
    for(var i in _classes){
        if(_classes[i]==_class){
            return true;
        }
    }
    return false;
}
</script>