Alert not working

This is not working since your update

if (count(Customers[Address == input.Address]) > 0)
{
    if (input.Input_Type = "From Job")
    {
        alert("This address is already in the database, click ok to go back to the job form");
        rec = Customers [Address == input.Address];
        input.Address = rec.Address;
        openUrl("#Form:Job?Lookup_Customer=" + input.Address, "same window");
    }
    else
    {
        alert("This address is already in the database, click ok input another customer");
        openUrl("#Form:Customers", "same window");
    }
}

comes from this form

https://creator.zoho.com/mrcomputer/mrcomputer/#Form:Customers

Thanks

Nigel