//Abrir Pop-up -----------------------------------------------------------------//

function open_window(theURL,winName,features) {
  window.open(theURL,winName,features);
}

//-----------------------------------------------------------------------------//


//Show Item -----------------------------------------------------------------//

function ShowItem(obj){
	if(document.getElementById){
	var el = document.getElementById(obj);
	var ar = document.getElementById("conteudo").getElementsByTagName("div"); //DynamicDrive.com change
		if(el.style.display != "block"){ //DynamicDrive.com change
			for (var i=0; i<ar.length; i++){
				ar[i].style.display = "none";
			}
			el.style.display = "block";
		}else{
			el.style.display = "none";
		}
	}
}

//-----------------------------------------------------------------------------//

//Trocar BG -----------------------------------------------------------------//

var images=new Array();
images[0]="1.jpg";
images[1]="2.jpg";
images[2]="3.jpg";
images[3]="4.jpg";
var amount = Math.floor(Math.random() * images.length);
document.write('<style>#topo{background-image:url(imagens/topo'+images[amount]+');}</style>');

//-----------------------------------------------------------------------------//