function Contato() {
	var Check = 0;
	if (document.form.nome.value == '') { Check = 1; }
	if (document.form.email.value == '') { Check = 1; }
	if (document.form.mensagem.value == '') { Check = 1; }
	if (Check == 1) {
		alert("Nome, email e mensagem devem ser preenchidos.");
		return false;
	} else {
		document.form.submit.disabled = true;
		return true;
	}
}
function show(valor){
	var xmlHttp;
		try {
		// Firefox, Opera 8.0+, Safari
			xmlHttp=new XMLHttpRequest();
		} 
		catch (e) {
		// Internet Explorer
			try {
				xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
			}
			catch (e) {
				try {
					xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
				}
				catch (e) {
					alert("Seu navegador não suporta AJAX!");
					return false;
				}
			}
		}
		xmlHttp.onreadystatechange=function() {
			if (xmlHttp.readyState != 4) {
				document.getElementById('showfoto').innerHTML = '<table width=100% height=100% border=0 cellpadding=0 cellspacing=0><tr><td align=center><img src=imagens/carregando.gif></td></tr></table>';
			}
			else if (xmlHttp.readyState==4) {
				document.getElementById('showfoto').style.display = '';
				document.getElementById('showfoto').innerHTML = xmlHttp.responseText;
			}
		}
	xmlHttp.open("GET",'showfoto.php?cod_foto='+valor,true);
	xmlHttp.send(null);
}