PHP search script and iFrame

Hi.
I´m trying to install a PHP search script for properties on http://www.spectoestates.com

So far, I´ve added the PHP code snippet into a PHP code widget, visible on all pages. When someone does a search, it launches this page where the results should be shown.

Only problem is that I don´t know how to implement the PHP codes and iFrame I´ve been handed to get the search results showing.

Here´s the info from the developer who handed it to me
The .txt file contains some PHP code which should be included in your new search results page to set the source of the <iframe>.

This is the content of the .txt file

<?php

$IframeSrc = "http://weblink.resales-online.com/weblink/inc/start.asp?P1=BuscaresResales" ;

$QS = trim($_REQUEST["QS"]) ;
$VL = trim($_REQUEST["VL"]) ;

if ( ( $QS != "" ) || ( $VL != "" ) )
{
      $IframeSrc = "http://weblink.resales-online.com/weblink/inc/SearchAgent.asp" ;
      $IframeSrc .= "?P1=" . trim($_REQUEST["P1"]) ;
      $IframeSrc .= "&P2=" . trim($_REQUEST["P2"]) ;
      $IframeSrc .= "&QS=" . $QS ;
      $IframeSrc .= "&VL=" . $VL ;
      $IframeSrc .= "&P_Country=" . trim($_REQUEST["Country"]) ;
      $IframeSrc .= "&P_Area=" . trim($_REQUEST["Area"]) ;
      $IframeSrc .= "&P_Location=" . trim($_REQUEST["Location"]) ;
      $IframeSrc .= "&P_Type=" . trim($_REQUEST["Type"]) ;
      $IframeSrc .= "&P_Beds=" . trim($_REQUEST["Beds"]) ;
      $IframeSrc .= "&P_Min=" . trim($_REQUEST["PriceMin"]) ;
      $IframeSrc .= "&P_Max=" . trim($_REQUEST["PriceMax"]) ;
      $IframeSrc .= "&P_Ref=" . trim($_REQUEST["RefNum"]) ;
      $IframeSrc .= "&RentalType=" . trim($_REQUEST["RentalType"]) ;
      $IframeSrc .= "&RentalDate=" . trim($_REQUEST["RentalDate"]) ;
      $IframeSrc .= "&RentalDateFrom=" . trim($_REQUEST["RentalDateFrom"]) ;
      $IframeSrc .= "&RentalDateTo=" . trim($_REQUEST["RentalDateTo"]) ;
      $IframeSrc .= "&CustomArea=" . trim($_REQUEST["CustomArea"]) ;
      $IframeSrc .= "&OwnerId=" . trim($_REQUEST["OwnerId"]) ;
      $IframeSrc .= "&Lang=" . trim($_REQUEST["Language"]) ;
}
?>

<iframe name="ROL_iframe" marginwidth="0" marginheight="0"
src="<?php echo $IframeSrc ?>"
frameborder="NO" noresize width="615" height="2300" align="center" scrolling="no" onload="window.scroll(0,0)"></iframe>

So….
It seems to me I have to implement the PHP code somewhere else and leave the iFrame codes on the search result page…but, I don´t know where.

I would appreciate any answer taking my slightly closer to a solution.

Thomas