var searchValueDef = 'поиск по сайту';

function searchClear(field) {
	if (field.value == searchValueDef) {
		field.value = '';
	}
}

function searchFill(field) {
	if (field.value == '') {
		field.value = searchValueDef;
	}
}

function searchCheck(form) {
	return (form['edit[keys]'].value != searchValueDef);
}