Hi there,
Its easy to do for me, and as I can see You are trying to do it by yourself, so if You will need informations I can say You how to do this. If i understood good Your task, You need to place some hidden variable in Your form, in this way, that it will be not shown in form as a form to set. We can do this in very short time, in easy way for us both. After finish this job, I can take care about rest of Your problems ( html error ) and post from get. Its not require to split those tasks between a lot of freelancers. When can we start ?