function validate_email(field,alerttxt) {
	with (field) {
		var apos = value.indexOf("@");
		var dotpos = value.lastIndexOf(".");
		if (apos < 1 || dotpos - apos < 2){
			alert(alerttxt);
			return false;
		}
		else 
			return true;
	}
}

function validate_form(thisform) {
	with (thisform) {
		if (validate_email(email,"Invalid email address.") == false) {
			email.focus();
			return false;
		}
	}
}