function nav(){
	if(window.XMLHttpRequest)
		return new XMLHttpRequest();
	else if (window.ActiveXObject)
		return new ActiveXObject("Microsoft.XMLHTTP");
	else
		alert("Seu navegador no  compatível com AJAX.")
}

var env = nav();

function Enviar(){
	env.open("post","interno/logon.php?acao=nome&t="+ new Date().getTime());
	env.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
	env.onreadystatechange = Check;
	var usrnome = document.getElementById("usrnome").value;
	var usrpass = document.getElementById("usrpass").value;
	var param = 'txtusuario=' + usrnome + '&txtpass=' + usrpass;
	env.send(param);


}

function Check(){
	/*if(env.readyState==3){
		document.getElementById("mensagem").innerHTML = "<img src=imgs/ajax-loader.gif>";
	}*/
	if(env.readyState==4){
		if(env.responseText=="inv&aacute;lido"){
					alert("Não logou");

			//window.location ="../index.html";
		}else if(env.responseText=="v&aacute;lido"){
			window.location ="interno/comum/micropost.php";
			//alert("Logou");
		}else{
		document.getElementById("mensagem").innerHTML = env.responseText;
		document.getElementById("mensagem").style.color ="red";
		//alert(env.responseText);
}
}
}
function tecla(event){
	var botao =  event.keyCode ? event.keyCode : event.which ? event.which : event.charCode;
	if(botao == 13){
		Enviar();
	}
}