function ajaxGet(pagina,alvo)
{
var xmlHttp;
try
  {
  xmlHttp=new XMLHttpRequest();
  }
catch (e)
  {
  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()
    {
	document.getElementById(alvo).innerHTML='<br /><br /><br /><br /><br /><br /><center><img src=img/ajax-loader.gif></center>';
    if(xmlHttp.readyState==4)
      {
		  document.getElementById(alvo).innerHTML=xmlHttp.responseText;
      }
    }
  xmlHttp.open("GET",pagina+'&bustcache='+new Date().getTime(),true);
  xmlHttp.send(null);
}


function letter()
{
	
  var obj = eval("document.forms[0].textletter");
  var txt = obj.value;
  if ((txt.length != 0) && ((txt.indexOf("@") < 1) || (txt.indexOf('.') < 7)))
  {
    
    var sp1 = document.getElementById("sp1");
    sp1.innerText = 'e-mail incorreto!!!';
	
	/*alert('Email incorreto');*/
	obj.focus();
  }
  else
  {

var xmlHttp;
try
  {
  xmlHttp=new XMLHttpRequest();
  }
catch (e)
  {
  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.open("POST", "grava.php", true);
  xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
  var params = "email="+document.forms[0].textletter.value;  
  xmlHttp.send(params);
  
  document.forms[0].textletter.value = 'e-mail';
  var sp1 = document.getElementById("sp1");
  sp1.innerText = 'e-mail enviado!!!';
  }
     
}