function showProud(numeroDeItens){
	var numeroItem = Math.floor(Math.random()*(numeroDeItens));
	if(document.getElementById("opportunities_" + numeroItem)){
		document.getElementById("opportunities_" + numeroItem).style.display = 'block';
	}
}

function showDidYouKnow(numeroDeItens){
	var numeroItem = Math.floor(Math.random()*(numeroDeItens));
	if(document.getElementById("did_you_know_" + numeroItem)){
		document.getElementById("did_you_know_" + numeroItem).style.display = 'block';
	}
}

var idMenuAberto;
function showMenu(idMenu){
	if(idMenu != idMenuAberto || $("#btn_"+idMenu).attr("src") == "images/btn_mais.jpg"){
		$(".menu_nivel_1").slideUp("normal");
		$("#"+idMenu).slideDown("normal");
		$(".btn").attr("src","images/btn_mais.jpg");
		$("#btn_"+idMenu).attr("src","images/btn_menos.jpg");	
	}else{
		$(".menu_nivel_1").slideUp("normal");
		$("#btn_"+idMenu).attr("src","images/btn_mais.jpg");
	}

	idMenuAberto = idMenu;
}

function showMenuNivel2(idMenu){
	$(".menu_nivel_2").slideUp("normal");
	$("#"+idMenu).slideDown("normal");
}