function getLogin(obj)
{
	var poststr = "a=null";  
	poststr += "&usu_login=" + escape( encodeURI( $('#usu_login').val() ) );
	poststr += "&usu_senha=" + escape( encodeURI( $('#usu_senha').val() ) );
    poststr += "&acao=" + escape( encodeURI( $('#bAcessar').val() ) );	 
	if(validaLogin() == true)
	{
		//obj.reset();
        $('#usu_senha').val() = "";
		postLogin('includes/validar_login.php', poststr);
	}
}

function postLogin(url, parameters) {
      http_request = false;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
         	// set type accordingly to anticipated content type
            //http_request.overrideMimeType('text/xml');
            http_request.overrideMimeType('text/html');
         }
      } else if (window.ActiveXObject) { // IE
         try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
            try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
         }
      }
      if (!http_request) {
         alert('Cannot create XMLHTTP instance');
         return false;
      }
      
      http_request.onreadystatechange = alertContents;
      http_request.open('POST', url, true);
      http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      http_request.setRequestHeader("Content-length", parameters.length);
      http_request.setRequestHeader("Connection", "close");
      http_request.send(parameters);
}

function alertContents(){
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            //alert(http_request.responseText);
            result = http_request.responseText;
            if(result == "1")
            {
                $('#usu_login').val()="";
                $('#usu_senha').val()="";
                document.location.href = 'clientes-listar-arquivos.php';
            }
            else
                alert(result);
            //ajax_cliContatosLista()
			//ajax_cliContatosLista('includes/ajax_cliente_contatos_listar.php', '');
         } else {
            alert("Problemas com a requisição");
         }
      }
}

function exit(url)
{
    if(window.confirm('Deseja sair?') == true)
        document.location.href = url;
}