/*

*/

function listbox_toggle_image(listbox_id){
	var plus_image = listbox_id + '_plus';
	var minus_image = listbox_id + '_minus';

	$(plus_image).toggle();
	$(minus_image).toggle();
}

function listbox_expand(listbox_id) {
	effect_result = Effect.BlindDown(listbox_id,{duration:1.0});
	listbox_toggle_image(listbox_id);
	return false;
}

function listbox_contract(listbox_id) {
	var effect_result = null;
	effect_result = Effect.BlindUp(listbox_id,{duration:1.0});
	listbox_toggle_image(listbox_id);
	return false;
}