function initPartes() {
	if(document.getElementById("Partes") != undefined) {
		var ar = document.getElementById("Partes").getElementsByTagName("span");
		for (var i=0; i<ar.length; i++){
				ar[i].style.display = "none";
		} 
	}
}

function mostra(obj){
    
 if(document.getElementById){
  var el = document.getElementById(obj);
  if(el.style.display != "block"){
   el.style.display = "block";
  }else{
   el.style.display = "none"; } 
  }
}