function loadExternalSrc(src) {
	var ifrm = document.createElement('IFRAME');
	ifrm.setAttribute('src', src);
	ifrm.style.width = '0px';
	ifrm.style.height = '0px';
	ifrm.style.display = 'none';
	document.body.appendChild(ifrm);
}

function registerEmail() {
	var email = document.getElementById('email').value;
	if (email.length == 0 || email.indexOf('@') == -1 || email.indexOf('.') == -1) {
		alert('Please enter a valid email address');
		return false;
	}
	loadExternalSrc('signup/addemail.php?email=' + email);
	var formDiv = document.getElementById('overdiv');
	formDiv.className = 'invisible';
	document.getElementById('success').style.visibility = 'visible';
	
	return false;
}