Not loading the content from an external server

[Deroba]

Ok, so this is the url http://air.deroba.org/do.php?vid=SR6iYWJxHqs -> Works and sends the info fine.

Now here is the code running main server:

<script type="text/javascript">
function DownloadAndConvert(f)
{
//document.getElementById("process").style.display = "block";
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4) {
	if(xmlhttp.status==200) {	
		document.getElementById("received-content").innerHTML="CORRECT";
 *   } else { 
		document.getElementById("received-content").innerHTML="FAILED";
	 }
	}
  }
xmlhttp.open("GET", "air.deroba.org/do.php?vid=" + f.vid.value, true);
xmlhttp.send();
}
</script>

<div id="content"><div id="content-body">
<center>
<form name="input" method="get" onsubmit="return DownloadAndConvert(this);">
YouTube Video ID <input type="text" name="vid" id="vid" /><br />
<input type="submit" value="Comenzar!" />
</form><br /><br />
<div id="process" style="display:none;"><img src="http://deroba.org/img/loading.gif" /></div>
<div id="received-content">
Content should change
</div>
</center>
</div>

Any ideas why it will always show FAILED and then reload website?

Thanks

[Deroba]

Just to add, the content is received correctly(I used wireshark). But the browser won't show it.

Maybe because i has spaces?

[Deroba]

Nope, I changed the whole output of the php code to just be HOLA(hello in spanish) didn't work either.

What am I doing wrong here!