I have a form and which has several fields but two fields are   TV station and Market ( Market is the lookup field of market Form). 

below is the data format.

I am trying to update this form data by using another stainless form.What I am trying to do is put a Market field drop down above on the stainless form and when user select the market name  from drop down then a script will run to retrieve the related TV station name in the next tv station drop down field.

For instance , if user select "Market1" from Market drop down field then in the TV station Field only show , TV1, TV2, TV3 . 

 I have tried the below code but not working:

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Stainless form:

Could you please help me to fix this.

Thanks

Arfater.