I was not able to view your sample page with the username and password provided. It seems that you have a dynamic dropdowns implementation in place and would like for the child menu to hold URL values from your table correct? If so you are mostly there, to get the page to go to the URL of the selected value in the child list you will need to use some javascript. In your js code you will have the onclick of the go button do a window.open call. In this call you will use the value of the selected index's option of this child list. So the go button's onclick event might be set like this:
onclick="window.open(getElementById('<the id of your child select list>').options[getElementById('<the id of your child select list>').selectedIndex].value)"
