OnChange event of dropdown list box to trigger a function to reload the page with selected data

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We have created one dropdown list box by using data from MySQL table as option values. User can select one of the option from the drop down list box. On selection of the option, the onChange event will trigger one JavaScript function. Inside this function we will read the user selection value and by using this value we will reload the page by carrying the selected value to address bar as name value pair.

This is part of the script to create two dependant dropdown list boxes where selection of any option or fist drop down list will change the options of second dropdown list with matching data. This is same as narrowing the selection based on the options selected from the first list.