function checkListSignup() {
	var f = document.listSignup;
  	if (f.email.value == "") {
		alert("You must enter your email address");
		return false;
	}
	else {
		temp = f.email.value + " ";
		found = temp.search(/[\w\.-]+@([\w-]+\.){1,3}[a-zA-Z]{2,}\s{1}/);
		if (found != 0) {
			alert("Email must be in the form abc@def.com");
			return false;
		}
	}
	return true;
}