//Ajax requesting
var http_request = false;

//retFunction is the function switch set prior to making an ajax request
var retFunction;

function makeRequest(url) {
  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;
  }

  //append rand so url doesn't cache
  if(url.search(/\?/)!=-1) var use_url = url + "&rand="+Math.random();
  else var use_url = url + "?rand="+Math.random();

  http_request.onreadystatechange = alertContents;
  http_request.open('GET', use_url, true);
  http_request.send(null);
}

function alertContents() {
  if (http_request.readyState == 4) {
     if (http_request.status == 200) {
        //alert(http_request.responseText);
        result = http_request.responseText;
        //processResults function is unique to page
        processResults(result);          
     } else {
        alert('There was a problem with the request.');
     }
  }
}


function processResults(result) {
	if(retFunction=='captureEmail') {
		document.getElementById('email_capture_messaging').innerHTML = result;	
	}
}

function captureEmail() {
	document.getElementById('email_capture_messaging').style.visibility='visible';
	retFunction = 'captureEmail';
	makeRequest("/ajax/captureEmail.php?email_address="+document.email_capture.email_address.value);	
}