function search_toggle() {
	if (!document.getElementById('s')) return false;

	var search_field = document.getElementById('s');
	var original_value = search_field.value;

	search_field.onfocus = function() {
		if (this.value == original_value) this.value = '';
	}
	search_field.onblur = function() {
		if (this.value == '') this.value = original_value;
	}
}

addDOMLoadEvent(search_toggle);