<script src="js/jquery-1.3.2.js"></script>
<script>
function doit(){
    alert($("input[name='ChooseOne']:checked").length);
}

</script>

<input type="checkbox" name="ChooseOne" >
<input type="checkbox" name="ChooseOne" >
<input type="checkbox" name="ChooseOne" >
<input type="checkbox" name="ChooseOne" >
<input type="checkbox" name="ChooseOne" >

<input type="button" value="get" onclick="doit()">

------解决方案--------------------
简单的还是用js来实现吧

接分咯