[Feedback] Open Url not working

I am attempting to use the open url command and it's simply not working for me.

I am amending Booking_Dates > on add> Validate
and I've inserted the following code:
valid=thisapp.abs.FncValidateDates(input.Booked_Date, input.End_Date, input.Apartment_Code);
if(valid)
{
    openUrl("http://creator.zoho.com/webwaves/apartment-booking-system/#Form:Apartment_Rates","new window");
    alert "Chosen dates are valid what next?";
    cancel submit;
}
else
{
    alert "Your chosen dates are already booked, please select alternative dates";
}
cancel submit;

The alert indicated the dates chosen are valid but the open url does not work no matter which window option I choose.