Add operational magnifier to search box

Hi,

Is there anyway of adding an operational magnifier or button to the search box within the header area? I realise there is the option of adding a search box widget into the header area that contains the magnifier but I want the search box to appear within the page menu at the far right hand side. I can achieve using padding on the current search box but wouldn't know how to attempt this using a widget or editing the Page menu bar itself.

Any help or guidance will be much appreciated.

Thanks,

Gavin