better handling of widescreen theme

@rbgarga - as discussed stops column buttons being draw on other niftyOutter divs

```jQuery('<br/><br/><div><div id =\"addCol\" style=float:left><img src=\"./themes/pfsense_ng_fs/images/icons/icon_plus.gif\"/>&nbsp;Add column&nbsp;</div><div id =\"delCol\" style=float:left><img src=\"./themes/pfsense_ng_fs/images/icons/icon_x.gif\"/>&nbsp;Delete column</div><br/><br/></div> ').insertBefore('#niftyOutter.fakeClass');```

The above line could be trimed more to end.. insertBefore('.fakeClass');

But I think its better to check for id & class