Validation of checkbo with same name : I need to show error if none of the below checkboe are checked using using javascript.Please help..

    <tr>
    <td>Status</td>
    <td colspan="3">
    <input type="checkbox" name="chk_stat[]"   value="single" id="chk_stat"> single    
								   
    <input type="checkbox" name="chk_stat[]" value="married" id="chk_stat"> Married
								    
    <input type="checkbox" name="chk_stat[]" value="divorcee" id="chk_stat"> Divorcee 
								   
    <input type="checkbox" name="chk_stat[]" value="student" id="chk_stat"> Student
    </td>
    </tr>