var http = false;

if(navigator.appName == "Microsoft Internet Explorer") {
  http = new ActiveXObject("Microsoft.XMLHTTP");
} else {
  http = new XMLHttpRequest();
}

function validate() {
  http.abort();
 
  var rt="wp-content/themes/reify/sample.php";
  http.open("GET", rt, true);
  http.onreadystatechange=function() {
    if(http.readyState == 4) {
		if(document.getElementById('foo')!=null){
			document.getElementById('foo').innerHTML = http.responseText;
		}
	}
  }
  http.send(null);
}