The Custom Search Box requires the included Javascript functions to work properly. In addition the form elements must retain the names and IDs set for them. Please ensure that the browser in question has Javascript turned on. Then, check the source code on your browser and make sure that the Javascript was rendered properly on your pages and that the form elements have the same names as the code sent to you. If the Search Box code was entered using a content management or authoring system, that system may have stripped out the Javascript code or changed or erased form element names.