Customizing Search by ID, nickname and tag

Does anyone know how to customize the three default search boxes at the top of the simple search page (ID, nickname and tag)? 

I want there to be four: name, nickname, email and keyword

& I need to make sure they refernce the database properly in order to ensure search results. 

Thanks in advance

I honestly have no idea how to do that. But if anyone does know then I am certainly looking forward to the answer also.

You can find out how to eliminate them from view here:

http://www.expertzzz.com/forumz/?action=goto&topic_id=17646

What would you like to put in it?  The file to start this trick is search.php and here is the section that applies to it:

//collect inputs

$oPF = new BxDolProfileFields($iPFArea);

$aRequestParams = $oPF -> collectSearchRequestParams();

if( isset( $_REQUEST['ID'] ) and (int)$_REQUEST['ID'] )

$aRequestParams['ID'] = (int)$_REQUEST['ID'];

if( isset( $_REQUEST['NickName'] ) and trim( $_REQUEST['NickName'] ) )

$aRequestParams['NickName'] = trim( process_pass_data( $_REQUEST['NickName'] ) );

if( isset( $_REQUEST['Tags'] ) and trim( $_REQUEST['Tags'] ) )

$aRequestParams['Tags'] = trim( process_pass_data( $_REQUEST['Tags'] ) );

if( isset( $_REQUEST['distance'] ) and (int)$_REQUEST['distance'] )

$aRequestParams['distance'] = (int)$_REQUEST['distance'];

Now it's pretty self explanatory on how to adjust it, for example to do age search you would just add another code string referring to it.  Play with it a little (use system name) and you will begin to see what you can do.