before the class declaration.

Here is the code it is falling over on, any help would greatfully received!!!

if(typeof Vehicles == "undefined") Vehicles={};
Vehicles_class = function() {};
Object.extend(Vehicles_class.prototype, Object.extend(new AjaxPro.AjaxClass(), {
VehicleMakeSelectedIndexChanged: function(vehicleMakeId) {
return this.invoke("VehicleMakeSelectedIndexChanged",
{"vehicleMakeId":vehicleMakeId},
this.VehicleMakeSelectedIndexChanged.getArguments().slice(1));
},
VehicleModelSelectedIndexChanged: function(vehicleMakeId,
vehicleModel) {
return this.invoke("VehicleModelSelectedIndexChanged",
{"vehicleMakeId":vehicleMakeId, "vehicleModel":vehicleModel},
this.VehicleModelSelectedIndexChanged.getArguments().slice(2));
},
VehicleEngineSize: function(vehicleMakeId, vehicleModelName,
productionYear, fuelTypeId, transmissionTypeId) {
return this.invoke("VehicleEngineSize",
{"vehicleMakeId":vehicleMakeId, "vehicleModelName":vehicleModelName,
"productionYear":productionYear, "fuelTypeId":fuelTypeId,
"transmissionTypeId":transmissionTypeId},
this.VehicleEngineSize.getArguments().slice(5));
},
VehicleEngineSizeIndexChanged: function(vehicleMakeId,
vehicleModelName, productionYear, fuelTypeId, transmissionTypeId,
engineSize) {
return this.invoke("VehicleEngineSizeIndexChanged",
{"vehicleMakeId":vehicleMakeId, "vehicleModelName":vehicleModelName,
"productionYear":productionYear, "fuelTypeId":fuelTypeId,
"transmissionTypeId":transmissionTypeId, "engineSize":engineSize},
this.VehicleEngineSizeIndexChanged.getArguments().slice(6));
},
url:
'/ajaxpro/Framework.Vehicles.VehicleDetails,Framework.Vehicles.ashx'
}));
Vehicles = new Vehicles_class();