// JavaScript Document
function bt_voltar(){
	if (!document.getElementsByTagName) return false;
	var spans = document.getElementsByTagName("span");
	for(x = 0; x < spans.length; x++){
		if(spans[x].className.match("voltar"))
			spans[x].onclick = function(){ history.go(-1); };
	}
	if(document.location.href.indexOf("web") != -1)
		document.getElementById("link_topo").onclick = bt_topo;
	else if(document.location.href.indexOf("design") != -1)
		document.getElementById("link_topo").onclick = bt_topo;
}
function bt_topo(){
	if(!document.getElementById) return false;
	var bt_topo = document.getElementById("link_topo");

	if (!document.getElementsByTagName) return false;
	var spans = document.getElementsByTagName("span");
	for(x = 0; x < spans.length; x++){
		if(spans[x].className.match("voltar")){
			onclick_atual = new String(spans[x].onclick); 
			position = x;
		}
	}
	position_atual = parseInt(onclick_atual.substr(-6,2));
	position_novo = position_atual - 1;
	//onclick_novo = new String("function(){ history.go(" + position_novo + "); }");
	//spans[position].onclick = onclick_novo;
	spans[position].onclick = function(){ history.go(position_novo); };
}
window.onload = bt_voltar;