function subscribe() {
	var email=$('#newsletter').val();
	if(IsEmail(email)){
		var dataString = 'email=' + email;  
		//alert (dataString);return false;  
		$.ajax({  
			type: "POST",  
			url: "sub.php",  
			data: dataString,  
			success: function() {  
				$('#newsletter-form').html("<div id='message'></div>");  
				$('#message').html("You have been added to our mailing list.")  
				.hide()  
				.fadeIn(700, function() {
					$('#message').append(" ");  
				});  
			}  
		});  
		return false; 
	}else{
		alert("Please enter a valid email address");
	}
	return false;
}    

function IsEmail(email) {
	var regex = /^([a-zA-Z0-9_\.\-\+])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (regex.test(email)) return true;
	else return false;
}