selecting all the checkboxes inside a form

selecting all the checkboxes inside a form

Hello,

When I submit a form, I need to known wich checkboxes are checked. How can I do that??

<form id="selemployee" onsubmit="checkemployee();return false;">
<table border="1">
 <thead>
 <tr>
 <th>Sel</th>
 <th>Apellidos</th>
 <th>Nombre</th>
 <th>Seccion</th>
 </tr>
 </thead>
 <tbody>
 
 <tr>
 <td><input class="check1" id="check1" type="checkbox" value="1" /></td>
 <td>Garcia Garcia</td>
 <td>Ferando</td>
 <td>Administracion</td>
 </tr>
 
 </tbody>
</table>
<input type="submit">

I tried with:
var fields = jQuery("#selemployee input:checkbox").serializeArray(); 
but it does not work




Thanks in advance