var xmlhttp,alerted,output;
/*@cc_on @*/
	/*@if (@_jscript_version >= 5)
		try {
		xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
			} catch (E) {
				alert("You must have Microsofts XML parsers available");
			}
		}
	@else
		alert("You must have JScript version 5 or above.");
	xmlhttp = false;
	alerted = true;
@end @*/

if (!xmlhttp && !alerted) {
	try {
		xmlhttp = new XMLHttpRequest();
	} catch (e) {
		alert("Update your browser! http://www.mozilla.org");
	}
}

function checkEmail() {
	if (document.getElementById('newslettersubscribe').value != '') {
		var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
		if (filter.test(document.getElementById('newslettersubscribe').value)) {
			var userinput = prompt('Please confirm your e-mail address.','');
			if (userinput && userinput == document.getElementById('newslettersubscribe').value) {
				
				/********************************/
				
				if (xmlhttp) { 
					d = document;
					xmlhttp.open("GET", '/xmlhttp/xmlhttp.php?newsletter=1&email=' + document.getElementById('newslettersubscribe').value,true);
					xmlhttp.onreadystatechange = function () {
						if (xmlhttp.readyState == 4) {
							alert(xmlhttp.responseText);
							document.getElementById('newslettersubscribe').value = '';
						}
					}
					xmlhttp.send(null);
				} else
					alert('An error occurred');
				
				/********************************/
				
			} else {
				alert('You did not type the same e-mail address twice!');
				document.getElementById('newslettersubscribe').focus();
			}
		} else {
			alert('Not a valid e-mail address!');
			document.getElementById('newslettersubscribe').focus();
		}
	} else
		document.getElementById('newslettersubscribe').focus();
}

function unregister() {
	var userinput = prompt('What e-mail address do you wish to unregister from the Senseneers newsletter?',typeof(document.getElementById('newslettersubscribe').value) == 'undefined' || document.getElementById('newslettersubscribe').value == '' ? '' : ''+document.getElementById('newslettersubscribe').value);
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(userinput)) {
		if (xmlhttp) { 
			d = document;
			xmlhttp.open("GET", '/xmlhttp/xmlhttp.php?unregister=1&email=' + userinput,true);
			xmlhttp.onreadystatechange = function () {
				if (xmlhttp.readyState == 4) {
					alert(xmlhttp.responseText);
					document.getElementById('newslettersubscribe').value = '';
				}
			}
			xmlhttp.send(null);
		} else
			alert('An error occurred');
	} else
		alert('Not a valid e-mail address!');
}

function makeContact() {
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	switch (false) {
		case document.getElementById('contactname').value != '' :
			alert('Please provide us with your name.');
			document.getElementById('contactname').focus();
			break;
		case filter.test(document.getElementById('contactemail').value) :
			alert('Not a valid e-mail address!');
			document.getElementById('contactemail').focus();
			break;
		case document.getElementById('contactquestion').value != '' :
			alert('Please enter a question first.');
			document.getElementById('contactquestion').focus();
			break;
		case prompt('Please confirm your e-mail address.','') == document.getElementById('contactemail').value :
			alert('You did not type the same e-mail address twice.');
			document.getElementById('contactemail').focus();
			break;
		default :
			if (xmlhttp) { 
				d = document;
				xmlhttp.open("GET", '/xmlhttp/xmlhttp.php?feedbackform=1&name=' + document.getElementById('contactname').value + '&email=' + document.getElementById('contactemail').value + '&question=' + document.getElementById('contactquestion').value,true);
				xmlhttp.onreadystatechange = function () {
					if (xmlhttp.readyState == 4) {
						alert(xmlhttp.responseText);
						document.getElementById('newslettersubscribe').value = '';
						document.getElementById('contactname').value = '';
						document.getElementById('contactemail').value = '';
						document.getElementById('contactquestion').value = '';
					}
				}
				xmlhttp.send(null);
			} else
				alert('An error occurred');
	}
}