I have a table with an 'add row' button. One row will be added once click on the button.

One of the fields is drop down list. I want to get the drop down list from the row before using document.formname.fieldname(), then use it in the new added row to generate the same drop down list.

Does anyone know how to do that?

HTML Code:
var cell1= row.insertCell(1);
var ce1 = document.rates.mID+'['+id+']'();
cell1.appendChild(ce1);