function checkSignupForm(){
	var firstname = document.getElementById("firstname");
	var lastname = document.getElementById("lastname");
	var source = document.getElementById("source");
	var emailpatern = /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
	var email = document.getElementById("email");
	var emailOK = emailpatern.exec(email.value);
	for (i=0;i<document.forms[0].visited.length;i++) {
		if (document.forms[0].visited[i].checked) {
			visited = document.forms[0].visited[i].value;
		}
	}
	if (firstname.value.length==0){
		alert('Please enter your first name!');
		return false;
	}else if (lastname.value.length==0){
		alert('Please enter your last name!');
		return false;
	}else if (!emailOK){
		alert('Please enter a valid email address!');
		return false;
	}else if (source.value == '.........'){
		alert('How did you hear about this promotion? Please select!');
		return false;
	}
	return true;
}