custom-search-form.php

/* 
*  This is used to override the WordPress search to ONLY search for a
*  custom post type. I used it on a photographer's website (only wanted
*  users to search for photo post types).
* 
*  I put this snippet somewhere in functions.php
*/
function bt_customize_search($form, $search_text, $button_text) {
	$onfocus = " onfocus=\"if (this.value == '$search_text') {this.value = '';}\"";
	$onblur = " onblur=\"if (this.value == '') {this.value = '$search_text';}\"";
	$custom_form = '
		<form method="get" action="' . get_option('home') . '/" >
		<input type="text" value="'. $search_text .'" name="s"'. $onfocus . $onblur .' />
		<input type="hidden" name="post_type" value="CUSTOM_POST_TYPE" />
		<input type="submit" value="'. $button_text .'" />
		</form>
	';
	return $custom_form;
}
add_filter('genesis_search_form', 'bt_customize_search', 10, 3);