function oculta(){
  document.getElementById('fixacam').style.display = 'none';
}

var posvertical = "topo";

function menufloat(){ 
  var startX = 300, startY = 200;
  var ns = (navigator.appName.indexOf("Netscape") != -1); 
  var d = document; 

  function ml(id){ 
    var el=d.getElementById?d.getElementById(id):d.all?d.all[id]:d.layers[id]; 
    if(d.layers)el.style=el; 
    el.sP=function(x,y){this.style.left=x;this.style.top=y;}; 
    el.x = startX;
  
    if (posvertical=="rodape") 
      el.y = startY; 
    else{ 
      el.y = ns ? pageYOffset + innerHeight : document.body.scrollTop + document.body.clientHeight; 
      el.y -= startY; 
    } 
    return el; 
} 
window.stayTopLeft=function(){ 
  if (posvertical=="topo"){  
    var pY = ns ? pageYOffset : document.body.scrollTop; 
    ftlObj.y += (pY + startY - ftlObj.y)/8; 
  } 
  else{ 
    var pY = ns ? pageYOffset + innerHeight : document.body.scrollTop + document.body.clientHeight; 
    ftlObj.y += (pY - startY - ftlObj.y)/8; 
  } 
  ftlObj.sP(ftlObj.x, ftlObj.y); 
  setTimeout("stayTopLeft()", 10); 
} 
  ftlObj = ml("fixacam"); 
  stayTopLeft(); 
}