function checkData() {

 /* Name ----------------------------------------------------- */
 
 if(document.contactForm.contactName.value=='') {
   alert("Please enter your name.");
   document.contactForm.contactName.focus();
   return;
 }
 
 /* Email ---------------------------------------------------- */
 
 if(document.contactForm.contactEmail.value=='') {
   alert("Please enter your email address.");
   document.contactForm.contactEmail.focus();
   return;
 }
 
 /* Message -------------------------------------------------- */
 
 if(document.contactForm.contactMessage.value=='') {
   alert("Please enter your message.");
   document.contactForm.contactMessage.focus();
   return;
 }
 
 /* Check logic ---------------------------------------------- */
 
 if(document.contactForm.logic.value.toLowerCase()=="cold") {
   sendForm();
 }
 else {
   alert("Try the logic question again. It was probably just a typo.");
   document.contactForm.logic.focus();
   return;
 }

}

function sendForm()
{
	var xmlHttp = GetXmlHttpObject();
	var loading = 0;
  if(xmlHttp==null)
  {
    alert("Your browser does not support AJAX");
    return;
  }
	url = "mailform.php?contactName="+document.forms[0].contactName.value+"&contactEmail="+document.forms[0].contactEmail.value+"&contactMessage="+document.forms[0].contactMessage.value;
	xmlHttp.onreadystatechange = displayConfirmation;	
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}
	
function displayConfirmation()
	{ 
	if(xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
		{
		  document.getElementById("cform").innerHTML = xmlHttp.responseText;
		}
  else if(loading<1)
		{
		  document.getElementById("cform").innerHTML = '<img src="images/ajax-loader.gif" alt="Loading" />';
		  loading++;
		}
	}

function GetXmlHttpObject()
{
	try
		{
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
		}
	catch (e)
		{
		// Internet Explorer
		try
			{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
			}
		catch (e)
			{
			try
				{
				xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
				}
			catch (e)
				{
				return false;
				}
			}
		}
	return xmlHttp;
}