ASP或Jquery 实现多个多选框和文本框，计算问题

如图，选择几个科目，计算出总课费。单科课费*科目数 = 总课费，我是想用按钮来实现计算。但我的按钮是动态生成的。代码在下面。哪位高手帮帮忙，实在是不会了。

 <script type="text/javascript"> 
 function jisuan(){

         alert("事件");
     }
</script>


<input name="<%=rs("id")%>dankekefei" type="text" id="dankekefei" value="100" size="4"></td>

               <td height="18" bgcolor="#FFFFFF" class="STYLE1"><div align="center">


                 <input type="checkbox" name="<%=rs("id")%>shuxue" id="shuxue">
                 <label for="shuxue">数</label>
                 <input type="checkbox" name="<%=rs("id")%>yuwen" id="yuwen">
                 <label for="shuxue">语</label>
                 <input type="checkbox" name="<%=rs("id")%>yingyu" id="yingyu">
                 <label for="shuxue">外</label>
                 <input type="checkbox" name="<%=rs("id")%>wuli" id="wuli">
                 <label for="shuxue">理</label>
                 <input type="checkbox" name="<%=rs("id")%>huaxue" id="huaxue">
                 <label for="shuxue">化</label>
                 <input type="checkbox" name="<%=rs("id")%>shengwu" id="shengwu">
                 <label for="shuxue">生</label>
                 <input type="checkbox" name="<%=rs("id")%>lishi" id="lishi">
                 <label for="shuxue">史</label>
                 <input type="checkbox" name="<%=rs("id")%>dili" id="dili">
                 <label for="shuxue">地</label>
                 <input type="checkbox" name="<%=rs("id")%>zhengzhi" id="zhengzhi">
                 <label for="shuxue">政</label>


                    </div></td>  






              <td height="18" bgcolor="#FFFFFF" class="STYLE1"><div align="center">

              <input name="<%=rs("id")%>jisuankefei" type="button" id="jisuankefei" size="6" value="计算课费" onClick="jisuan()"/>

调用：jisuan(this)

function jisuan(elem){
    var tr,dankefei,chk,t,obj = $(elem);
    tr = obj.parent().parent().parent();
    dankefei = parseFloat(tr.find('#dankekefei').val());
    if(isNaN(dankefei) || dankefei <= 0){
        alert('请先设置单科费');
        return false;
    }
    chk = tr.find('input[type=checkbox]:checked');
    if(chk.length < 1){
        alert('没有选择课程');
        return false;
    }
    t = (dankefei * chk.length).toFixed(2);
    alert('总费用：'+t);
}

 <table>
    <tr>
        <td><input name="dankekefei" type="text" id="dankekefei" value="100" size="4"></td>
        <td height="18" bgcolor="#FFFFFF" class="STYLE1">
            <div align="center">
                <input type="checkbox" name="shuxue" id="shuxue">
                <label for="shuxue">数</label>
                <input type="checkbox" name="yuwen" id="yuwen">
                <label for="shuxue">语</label>
                <input type="checkbox" name="yingyu" id="yingyu">
                <label for="shuxue">外</label>
                <input type="checkbox" name="wuli" id="wuli">
                <label for="shuxue">理</label>
                <input type="checkbox" name="huaxue" id="huaxue">
                <label for="shuxue">化</label>
                <input type="checkbox" name="shengwu" id="shengwu">
                <label for="shuxue">生</label>
                <input type="checkbox" name="lishi" id="lishi">
                <label for="shuxue">史</label>
                <input type="checkbox" name="dili" id="dili">
                <label for="shuxue">地</label>
                <input type="checkbox" name="zhengzhi" id="zhengzhi">
                <label for="shuxue">政</label>
            </div>
        </td>
        <td height="18" bgcolor="#FFFFFF" class="STYLE1">
            <div align="center"><input name="jisuankefei" type="button" id="jisuankefei" size="6" value="计算课费" onclick="jisuan(this)" />
                <input type="text" />
        </td>
    </tr>
    <tr>
        <td><input name="dankekefei" type="text" id="dankekefei" value="100" size="4"></td>
        <td height="18" bgcolor="#FFFFFF" class="STYLE1">
            <div align="center">
                <input type="checkbox" name="shuxue" id="shuxue">
                <label for="shuxue">数</label>
                <input type="checkbox" name="yuwen" id="yuwen">
                <label for="shuxue">语</label>
                <input type="checkbox" name="yingyu" id="yingyu">
                <label for="shuxue">外</label>
                <input type="checkbox" name="wuli" id="wuli">
                <label for="shuxue">理</label>
                <input type="checkbox" name="huaxue" id="huaxue">
                <label for="shuxue">化</label>
                <input type="checkbox" name="shengwu" id="shengwu">
                <label for="shuxue">生</label>
                <input type="checkbox" name="lishi" id="lishi">
                <label for="shuxue">史</label>
                <input type="checkbox" name="dili" id="dili">
                <label for="shuxue">地</label>
                <input type="checkbox" name="zhengzhi" id="zhengzhi">
                <label for="shuxue">政</label>
            </div>
        </td>
        <td height="18" bgcolor="#FFFFFF" class="STYLE1">
            <div align="center"><input name="jisuankefei" type="button" id="jisuankefei" size="6" value="计算课费" onclick="jisuan(this)" />
            <input type="text" />
        </td>
    </tr>
</table>
<script type="text/javascript" src="http://cdn.bootcss.com/jquery/1.7.1/jquery.min.js"></script>
<script type="text/javascript">
    function jisuan(btn) {
        var tr = $(btn).closest('tr'),tds=tr.find('td');
        var pirce = parseInt(tds.eq(0).find('input').val()) || 0;
        var l = tds.eq(1).find(':checkbox:checked').length;
        tds.eq(2).find(':text').val(pirce*l)
    }
</script>