$(document).ready(function() {
	$("#email").keyup(function(){
		var email = $("#email").val();
		//if ( email.length == 0 ) { alert("Il campo mail è obbligatorio!"); } 
		if(email != 0) {
			if(isValidEmailAddress(email)) {
				$("#validEmail").css({
					"background-image": "url('images/validYes.gif')"
				});
			}
			else {
				$("#validEmail").css({
					"background-image": "url('images/validNo.gif')"
				});
			}
		}
		else {
			$("#validEmail").css({
				"background-image": "none"
			});			
		}
	});
	
});
	
function isValidEmailAddress(emailAddress) {
	var pattern = new RegExp(/^(("[\w-\s]+")|([\w-]+(?:\.[\w-]+)*)|("[\w-\s]+")([\w-]+(?:\.[\w-]+)*))(@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$)|(@\[?((25[0-5]\.|2[0-4][0-9]\.|1[0-9]{2}\.|[0-9]{1,2}\.))((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\.){2}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\]?$)/i);
	return pattern.test(emailAddress);
}