https://jerusalem-ippo.org/gallery/modules/search/SearchBlock.js

1var search_SearchBlock_prompt;
2var search_SearchBlock_error;
3var search_SearchBlock_input;
4
5function search_SearchBlock_init(prompt, error) {
6    search_SearchBlock_promptString = prompt;
7    search_SearchBlock_errorString = error;
8    search_SearchBlock_input = document.getElementById('search_SearchBlock').searchCriteria;
9
10    search_SearchBlock_input.value = prompt;
11}
12
13function search_SearchBlock_checkForm() {
14    var sc = search_SearchBlock_input.value;
15    if (sc == search_SearchBlock_promptString || sc == '') {
16	alert(search_SearchBlock_errorString);
17	return false;
18    } else {
19	document.getElementById('search_SearchBlock').submit();
20	return true;
21    }
22}
23
24function search_SearchBlock_focus() {
25    if (search_SearchBlock_input.value == search_SearchBlock_promptString) {
26	search_SearchBlock_input.value = '';
27    }
28}
29
30function search_SearchBlock_blur() {
31    if (search_SearchBlock_input.value == '') {
32	search_SearchBlock_input.value = search_SearchBlock_promptString;
33    }
34}