function mostraItem(obj){
	base = document.getElementById("centrais").getElementsByTagName("div")
	for(i=0;i<base.length;i++){
		base[i].style.display="none";
	}
	document.getElementById(obj).style.display = "block";
}

function mostraItemSub(obj,group){
	base = document.getElementById(group).getElementsByTagName("div")
	for(i=0;i<base.length;i++){
		base[i].style.display="none";
	}
	document.getElementById(obj).style.display = "block";
}

function abreLink(obj,classe,group){
	base = document.getElementById(group).getElementsByTagName("div")
	for(i=0;i<base.length;i++){
		if (base[i].className == classe){
		base[i].style.display="none";
		}
	}
	document.getElementById(obj).style.display = "block";
}