var action = "<%=Url.Content('~/Postcode/GetAddressResults/')%>" + $get("Premise").value + "/" + $get("SearchPostcode").value
$.getJSON(action, null, function(data) {
$("#AddressDropDown").fillSelect(data);
});
routes.MapRoute(
"postcode",
"Postcode/GetAddressResults/{premise}/{postcode}",
new {
controller = "Motor", action = "GetAddressResults",
premise = "", postcode = ""
});