修改时多checkbox的选中

<tr>
<td width="10%" class="odd">
技师：
</td>
<td colspan="3">
<logic:notEmpty name="empList">
<logic:iterate id="emp" name="empList" indexId="index">
<input type="checkbox" name="CEmpId" id="emp${emp.CEmpId }"
value="${emp.CEmpId }" />
${emp.CEmpName }
</logic:iterate>
</logic:notEmpty>
<script>
var b="${objection.CEmpId}";
var a=b.split(",");
var empId=document.getElementsByName("CEmpId");
for(var i=0;i<a.length;i++)
{
for(var j = 0;j<empId.length;j++){
if(a[i]==empId[j].value){
document.getElementById("emp"+a[i]).checked=true;
}
}
}
</script>
</td>
</tr>