function abreBanner(){
	document.getElementById("floatBannerFundo").style.display="block";
	document.getElementById("floatBanner").style.display="block"; 
}
function fechaBanner(){
	document.getElementById("floatBannerFundo").style.display="none"; 
	document.getElementById("floatBanner").style.display="none"; 
}

var start = 15;
function diminui () {
	document.getElementById("contagem").innerHTML = "<a href='javascript:fechaBanner();'><font color='#ffffff'><u>FECHAR ("+start+")</u></font></a>";
  if (start > 0) {
	window.setTimeout ("diminui()", 1000);
  } else {
	fechaBanner();
  }
  start--;
}
diminui();