var undefined;
function activate(id,deactive){
	if(deactive != undefined){
		deactivate(deactive);
	}
	el = document.getElementById('menuitem'+id);
	if (el.className.indexOf('_active') == -1) {
		el.className = el.className +'_active';
	}
	
}
function deactivate(id, active){
	if(active != undefined){
		activate(active);
	}
	if(id != active){
		el = document.getElementById('menuitem'+id);
		el.className = el.className.replace('_active','');
	}
}

function show(id){
	var el = document.getElementById(id);
	if(el){
		el.style.display = 'block';
	}
}

function hide(id){
	var el = document.getElementById(id);
	if(el){
		el.style.display = 'none';
	}
}