function chkEmail() {
	if(document.getElementById('su').value == "Enter email address") {
		document.getElementById('su').value = "";
	} 
}
function chkEmail2() {
	if(document.getElementById('su').value == "") {
		document.getElementById('su').value = "Enter email address";
	}
}
function submitEmail() {
	var email = document.getElementById('su').value;
	if(email != "" && email != "Enter email address") {
		var emailRequest = new AsyncRequest();
		emailRequest.data="email="+email;
		emailRequest.method="POST";
		emailRequest.url="/cgi-bin/emailblindsignup.pl";
		emailRequest.cache=false;
		emailRequest.callback=function(responseText) {
			if(responseText == 1) {
				alert("Email address saved successfully, thank you.");
				//document.getElementById('signup').style.visibility = 'hidden';
			} else {
				alert("Error! There was a problem saving your email address or you have already signed up.");
			}
		}
		emailRequest.send(null);		
	}
}