Make sure you've turned PHP error reporting on, so you can get an error and not just a blank screen.

You can usually do it in .htaccess..

php_value display_errors On

is there no way i can edit the contents of this file: httpdocs/sapphire/search/SearchForm.php
in particular, this part:

   /**
    * Classes to search
    */   
   protected $classesToSearch = array(
      "SiteTree", "File"
   );

to somehow include my product catalogue?
also... if i can get this all to work, how will the results be displayed? because as the products aren't within a page per say, (they only appear in the table) what will the search results page display?? im a little worried we will get this up and running and the end result will be useless!

ideally, it should do something helpful to the customer, such as load & highlight the product(s) within the table. (like it does in the modelAdmin backend when you search)

OK i dropped it into the Catalogue.php controller section:

class Catalogue_Controller extends Page_Controller {

static $allowed_actions = array (
'ProductSearchForm'
);

}

now when i try and search i get:

Website Error
There has been an error

The website server has not been able to respond to your request.

here's what my full catalogue.php file now looks like:

<?php
class Catalogue extends Page {
public function ProductList ($filter = null){
if(!isset($_REQUEST['start'])) $_REQUEST['start'] = 0;
$limit = $_REQUEST['start'].",25";
return DataObject::get('Product', $filter, null, null, $limit);
}

public function ProductSearchForm() {
return new Form (
$this,
"ProductSearchForm",
new FieldSet(new TextField('s','')),
new FieldSet(new FormAction('doProductSearch','Search'))
);
}

public function doProductSearch($data, $form) {
if(isset($data['s'])) {
$filter = "SomeField LIKE '%".Convert::raw2sql($data['s'])."%'";
}
return array (
'ProductList' => $this->ProductList($filter)
);
}

}

class Catalogue_Controller extends Page_Controller {

static $allowed_actions = array (
'ProductSearchForm'
);

}

?>