function isblank (str)
{
	var i;
	var c;

	for (i = 0; i < str.length; i++) {
		c = str.charAt (i);
		if ((c != ' ') && (c != '\t') && (c != '\n'))
			return (false);
	}

	return (true);
}


function isemail (str)
{
	var re1 = new RegExp ("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
	var re2 = new RegExp ("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,4}|[0-9]{1,3})(\\]?)$");

	return (!re1.test (str) && re2.test (str));
}


function validate_ml_sub ()
{
	var empty_fields = "";
	var errors = "";
	var msg;
	var num_errs = 0;

	var first = document.ml_sub_form.first_name.value;
	var last = document.ml_sub_form.last_name.value;
	var email = document.ml_sub_form.email.value;

	if (isblank (first)) {
		empty_fields += "\n* First name";
		num_errs++;
	}
	if (isblank (last)) {
		empty_fields += "\n* Last name";
		num_errs++;
	}
	if (isblank (email)) {
		empty_fields += "\n* Email address";
		num_errs++;
	}

	if (!isemail (email)) {
		errors += "\nThe email address is not valid.";
		num_errs++;
	}

	if (num_errs == 0)
		return (true);
	else {
		msg  = "__________________________________________________\n\n"
		msg += "The form was not submitted because of the following error(s).\n"
		msg += "Please correct these error(s) and re-submit.\n";
		msg += "__________________________________________________\n\n"
	}

	if (empty_fields) {
		msg += "The following required field(s) are empty:" + empty_fields + "\n";
		if (errors)
			msg += "\n";
	}
	msg += errors;
	alert (msg);

	return (false);
}