function validate(SignUp) {
	var inputFields = new Array();
	var counter;
	var name;
	var msg = "Please complete the following fields:\n";
	var badFields = "";
	for (counter = 0; counter < inputFields.length; counter++) {
		name = inputFields[counter];
		if (SignUp.elements[name].value.length == 0) {
			if (name == "email") {
				badFields = badFields + "  -  \n";
			} else {
				badFields = badFields + "  - " + name + "\n";
			}
		}
	}
	if (badFields.length != 0) {
		alert(msg + badFields);
		return false;
	}
	if (SignUp.email.value.length > 0) {
		return emailCheck(SignUp.email.value);
	} else {
		return true;
	}
}

function emailCheck(emailStr) {
	var emailPat=/^(.+)@(.+)$/;
	var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]";
	var validChars="\[^\\s" + specialChars + "\]";
	var quotedUser="(\"[^\"]*\")";
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	var atom=validChars + '+';
	var word="(" + atom + "|" + quotedUser + ")";
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
	var matchArray=emailStr.match(emailPat);

	if (matchArray==null) {
		alert("Email address seems incorrect (check @ and .'s)");
		return false;
	}

	var user=matchArray[1];
	var domain=matchArray[2];

	if (user.match(userPat)==null) {
			alert("The username doesn't seem to be valid.");
		return false;
	}

	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
		for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				alert("Destination IP address is invalid!");
			return false;
			}
			}
			return true;
	}

	var domainArray=domain.match(domainPat);
	if (domainArray==null) {
		alert("The domain name doesn't seem to be valid.");
			return false;
	}

	var atomPat=new RegExp(atom,"g");
	var domArr=domain.match(atomPat);
	var len=domArr.length;
	if (domArr[domArr.length-1].length<2 || domArr[domArr.length-1].length>3) {
	   alert("The address must end in a three-letter domain, or two letter country.");
		return false;
	}

	if (len<2) {
		var errStr="This address is missing a hostname!";
		alert(errStr);
	return false;
	}

	return true;
}