var ajax;

	function mostraFoto(pasta, i, num)
	{
	
		ajax = funcaoAjax()
		
		var get = "mostra_foto.php"
		get = get + "?pasta=" + pasta
		get = get + "&i=" + i
		get = get + "&sid=" + Math.random()
		ajax.onreadystatechange = stateChanged
		ajax.open("GET", get, true)
		ajax.send(null)
		
		function stateChanged(){
			
			if (ajax.readyState == 4 || ajax.readyState == "complete") {
						  document.getElementById(num).innerHTML = ajax.responseText;
					  }
		}
	}
     	

function funcaoAjax() {
	
	var ajax = null;
		
	try {
		ajax = new XMLHttpRequest();
		} catch(e) {
			try {
				ajax = new ActiveXObject("Msxml2.XMLHTTP");
			} catch(e) {
				try {
						ajax = new ActiveXObject("Microsoft.XMLHTTP");
				} catch(E) {
						alert("Use um navegador descente, recomendo MOZILLA FIREFOX");
						return false;
				}
			}
		}
	return ajax;
}