/*** Version Statement
 * Author  : Webber Liao (wpliao + suv x gmail.com)
 * Date    : 2008 8 09
 * Version : 0.0.2
 ***/

function init(){
	visible_menu("");
}

function visible_menu(id){
	if (arguments.length > 0){ _global_visible_menu = id; }

	return _global_visible_menu;
}

function extend(id){
	if (visible_menu() !=  "" && visible_menu() != id){
		(document.getElementById(visible_menu()+'0')).style.display = "block";
		(document.getElementById(visible_menu()+'1')).style.display = "none";
	}

	if (id == "" || arguments.length < 0 ){
		alert("Comp.js: extend(id): empty id");
	} else {
		(document.getElementById(id+'1')).style.display = "block";
		(document.getElementById(id+'0')).style.display = "none";
	}

	visible_menu(id);
}

function retract(){
	if (visible_menu() !=  ""){
		(document.getElementById(visible_menu()+'0')).style.display = "block";
		(document.getElementById(visible_menu()+'1')).style.display = "none";
	}
}

function keep(){
	extend(visible_menu());
}

init();