jquery里统计radio按yes的次数搞不定

只要统计radio里按yes的次数，怎样实现，如果按了yes再按no则减1，如果原来是no改成yes则次数加1，这个怎么实现，radio里的name和value我是下面这样定义的，代码片段如下：



Yes
No





Has your relative had accidents because of weakness, dizziness,
or inability to get around?




Has use of the stove, oven or appliances become a safety problem
because of forgetfulness?




Are there hazardous conditions in his/her home, such as the
bathroom and bedroom being on separate floors?

只要统计被选择的yes的个数吧
[code="html"]
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">


New Document <!-- $(function(){ $("input:button").click(function(){alert($("input:checked[value=yes]").size())}); }); //-->

YesNo
Has your relative had accidents because of weakness, dizziness, or inability to get around?
Has use of the stove, oven or appliances become a safety problem because of forgetfulness?
Are there hazardous conditions in his/her home, such as the bathroom and bedroom being on separate floors?



[/code]