http = getHTTPObject();

function getHTTPObject(){
  var xmlhttp;

  /*@cc_on

  @if (@_jscript_version >= 5)
	try {
	  xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
	}catch(e){
	  try{
	  xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
	}catch(E){
	  xmlhttp = false;
	}
  }
  @else
	xmlhttp = false;
  @end @*/

  if(!xmlhttp && typeof XMLHttpRequest != 'undefined'){
	try {
	  xmlhttp = new XMLHttpRequest();
	}catch(e){
	  xmlhttp = false;
	}
  }

  return xmlhttp;
}

function doMath(){
  document.getElementById('loader').style.display = 'inline';
  document.getElementById('button1').style.display = 'none';
  document.getElementById('button2').style.display = 'none';
  var url = "confirm_pair.php?";
  url += "&q4=" + document.getElementById('q4').value;
  url += "&q6=" + document.getElementById('q6').value;
  url += "&q8=" + document.getElementById('q8').value;
  url += "&q10=" + document.getElementById('q10').value;

  http.open("GET", url, true);
  http.onreadystatechange = handleHttpResponse;

  http.send(null);
}

function handleHttpResponse(){
  if(http.readyState == 4){
	document.getElementById('answer').innerHTML = http.responseText;
  document.getElementById('loader').style.display = 'none';
  document.getElementById('button2').style.display = 'inline';
  }
}