Making search form input box text go away on focus in Genesis. http://sridharkatakam.com/make-search-form-input-box-text-go-away-focus-genesis/

clear-search-form.js

jQuery(document).ready(function($) {

	$('input').focusin(function() {
		input = $(this);
		input.data('place-holder-text', input.attr('placeholder'))
		input.attr('placeholder', '');
	});

	$('input').focusout(function() {
		input = $(this);
		input.attr('placeholder', input.data('place-holder-text'));
	});

});

gistfile1.php

add_action( 'wp_enqueue_scripts', 'sk_clear_search_form' );
function sk_clear_search_form() {

	wp_enqueue_script( 'clear-search-form',  get_stylesheet_directory_uri() . '/js/clear-search-form.js', array( 'jquery' ), '1.0.0', true );

}

gistfile2.php

add_filter( 'genesis_search_form', 'sk_search_form', 10, 4 );
function sk_search_form( $form, $search_text, $button_text, $label ) {

	$search_text = get_search_query() ? apply_filters( 'the_search_query', get_search_query() ) : apply_filters( 'genesis_search_text', __( 'Search this website', 'your-theme-slug' ) . '…' );

	$button_text = apply_filters( 'genesis_search_button_text', esc_attr__( 'Search', 'your-theme-slug' ) );

	$onfocus = "if ('" . esc_js( $search_text ) . "' === this.value) {this.value = '';}";
	$onblur  = "if ('' === this.value) {this.value = '" . esc_js( $search_text ) . "';}";

	$label = apply_filters( 'genesis_search_form_label', '' );

	$form = sprintf( '<form method="get" class="search-form" action="%s" role="search">%s<input type="search" name="s" value="%s" onfocus="%s" onblur="%s" /><input type="submit" value="%s" /></form>', home_url( '/' ), esc_html( $label ), esc_attr( $search_text ), esc_attr( $onfocus ), esc_attr( $onblur ), esc_attr( $button_text ) );

	return $form;

}

style.css

input:focus::-webkit-input-placeholder { color:transparent; }
input:focus:-moz-placeholder { color:transparent; } /* Firefox 18- */
input:focus::-moz-placeholder { color:transparent; } /* Firefox 19+ */
input:focus:-ms-input-placeholder { color:transparent; } /* oldIE ;) */