function abrir(site) {
	document.getElementById('iframe').style.display="block";
	document.getElementById('iframe').innerHTML = "<iframe src='"+site+"' width='747' height='580' scrolling='no' frameborder='0' name='interna'></iframe>";
}

function fechar() {
	document.getElementById('iframe').style.display="none";
	document.getElementById('iframe').innerHTML = "&nbsp;";
}