By first properly naming the checkboxes as array values (associative array in this case)
<td><input type="checkbox" name="equities[close]" id="equities[close]" value="close" /></td>
<td><input type="checkbox" name="equities[bid]" id="equities[bid]" value="bid" /></td>
<td><input type="checkbox" name="equities[ask]" id="equities[ask]" value="ask" /></td>
<td><input type="checkbox" name="equities[mean]" id="equities[mean]" value="mean" /></td>
<td><input type="checkbox" name="equities[manual]" id="equities[manual]" value="manual" /></td>
If Checked $POST['equities']['close']=close or $GET['equities']['close']=close ...