Código PHP:
<input type="checkbox\" name=\"usuarios\" value=\"25\" />
<input class=\"botonAccionesParticulares\" type=\"button\" onclick=\"desplegarMenuAccionesParticulares(1);\" value=\"%Acciones%\">
<div id=\"divMenuAccionesParticulares2\" class=\"divMenuAccionesParticulares\">
<table width=\"100%\" border=\"0\" cellpadding=\"0\" cellpadding=\"0\">
<tr><td style=\"cursor:pointer;border-bottom:solid 1px #FFA800;\">Accion 1</td></tr>
<tr><td style=\"cursor:pointer;border-bottom:solid 1px #FFA800;\">Accion 2</td></tr>
<tr><td style=\"cursor:pointer;border:none\">Accion 3</td></tr>
</table>
</div>
var_dump(addslashes(trim($extraColumns) ));