gistfile1.js

var nameserver = /^((([a-z0-9]([a-z0-9\-]{0,61}[a-z0-9])?\.)+[a-z]{2,6})|(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}))$/i;
$('#configure_domains_form').submit(function() {
	return $('input[name^="domainns"]').each(function(){
		if(nameserver.test($(this).val())){
			// Do nothing
		}
		else{
			if ($(this).val() == ""){
				if($(this).attr("name") == "domainns3" || $(this).attr("name") == "domainns4"){
					// Do nothing, it's ok for these to be Blank
				}
				else{
					alert($(this).attr("name") + ": Cannot be blank - you need 2 Nameservers. If in doubt, please use n1.krystal.co.uk and ns2.krystal.co.uk");
					return false;
				}
			
			}else{
				alert($(this).val() + " is not a valid nameserver : " + $(this).attr("name"));
				return false;
			}
		}
	});
});