// JavaScript Document
function exibePersiana(tipo){
	var persianas = document.getElementsByTagName("div");
	for(var i=0; i<persianas.length ; i++ ){
		if(persianas[i].className == "persiana"){
			persianas[i].className = "persiana_hide";
		}
	}
	document.getElementById(tipo).className = "persiana";
}