Hello,
When I try to get an adsense ad script using Ajax it doesn't show up... Why?

This is my code:

Code:
function beginajax()
{

xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var url="ads.php";


xmlHttp.onreadystatechange=stateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
} 

function stateChanged() 
{ 
if (xmlHttp.readyState==4)
{ 
document.getElementById("Google-Ads").innerHTML=xmlHttp.responseText;

}
}
How Can I do it?