function ajaxFunction(elemento,pagina) {
elemento.style.visibility = 'visible';
elemento.innerHTML = '<img src="img/aguarde.gif">';
var xmlhttp;
if (window.XMLHttpRequest){// code for IE7+, Firefox, Chrome, Opera, Safari
	xmlhttp=new XMLHttpRequest();
	}
	else 
	if (window.ActiveXObject){ // code for IE6, IE5
		xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
		else{
			alert("Your browser does not support XMLHTTP!");
			}
xmlhttp.onreadystatechange=function(){
									if (xmlhttp.readyState==4){
										elemento.innerHTML = xmlhttp.responseText;
										}
									}
xmlhttp.open("GET",pagina,true);
xmlhttp.send(null);
}