Setting options of dropdowns from javascript

Hi all,

I am new to coldfusion.
I have created a page called demo.cfm.It has a grid table with edit button on each row of grid.
When user wants to edit the values of grid row click on edit opens another page say demo1.cfm.
In demo1.cfm I want to set the values of cliked row in their corresponding fields.
I have two dropdowns. the options of those dropdowns i am passing from demo.cfm page.In demo1.cfm page in dropdown fields i want to set these options.

The dropdowns in demo1.cfm are dynamic dropdowns. second dropdown value is based on first dropdown value.
how can i set the options which I am getting from demo1.cfm as first option in dropdown.

please help me to resolve this issue.