Add javascript to gravity form

add_action("gform_pre_render_13", "add_form13_js", 10);
function add_form13_js($form) {
	$location = site_url("/thanks-for-your-donation");
	echo '
	<script type="text/javascript">
		jQuery(document).bind("gform_post_render", function(){
			jQuery(document).on("click", "#gform_submit_button_13", function(e) {
				if (document.getElementById("choice_13_18_1").checked) {
					//jQuery("#give-modal").hide();
				}
			});
		});
	</script>';
	return $form;

}