Get checkbox values (name field) http://jsfiddle.net/dvCmR/

form.html

<div id="checkboxes">
  <input id="chkbx_0" type="checkbox" name="c_n_0" checked="checked" /> Option 1
  <input id="chkbx_1" type="checkbox" name="c_n_1" checked="checked" /> Option 2
  <input id="chkbx_2" type="checkbox" name="c_n_2" checked="checked" /> Option 3
  <input id="chkbx_3" type="checkbox" name="c_n_3" checked="checked" /> Option 4
</div>
<input type="button" id="clickme" value=""click me, now! />

script.js

$("clickme").click(function(e){
  var selected = $("#checkboxes input:checked").map(function(i, el){
    return el.name;}).get();
    
    alert("selected = [" + selected + "]\nas string =\"" + selected.join(" ; ") + "\"");
  
});