function iniciaAjax(){
	if (window.ActiveXObject) {
		ajax = new ActiveXObject("Microsoft.XMLHTTP");
		
	}
	else{
		if(window.XMLHttpRequest){
			ajax = new XMLHttpRequest();
		}else{
			ajax = new ActiveXObject("Msxml2.XMLHTTP");
		}
	}
	
	return ajax;
}
function efetuaLogin(){
	var erro = false;
	var login = document.getElementById("user").value;
	var senha = document.getElementById("pass").value;
	for(var i=0; i<document.getElementById("form_login").elements.length; i++){
		if(document.getElementById("form_login").elements[i].className=="obrigatorio" 
			&& document.getElementById("form_login").elements[i].value==""){
			erro = true; 
		}
	}

	if(erro){
		alert("Todos Os Campos Devem ser Preenchidos");
		return false;
	}else{
		iniciaAjax();
		ajax.onreadystatechange = function(){
					
			if(ajax.readyState == 4){
				
				if(ajax.responseText == 1){	
					location.href="admin/redireciona.php";
				}else if(ajax.responseText == 2){
					alert("Login ou Senhas Incorretos");
				}
				
			}
			
		};
		
		
		
		var dados = "login="+login;
		dados += "&senha="+senha;
		ajax.open("POST", "admin/executaJslogin.php");
		ajax.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		ajax.send(dados);
	}
	return false;
}