title: Combobox change value of other combobox
body: <p>I have two comboboxes on an form. Each has the values Yes and No. What I want is when one is changed the other get the opposite (if the first is Yes the other is No).I need to do it with Javascript. I saw this question <a href="https://stackoverflow.com/questions/1778184/how-to-change-selected-value-in-combobox-using-javascript">How to change &quot;selected&quot; value in combobox using JavaScript?</a> but it is applied to only one combobox.</p>
  <p>How can I do this?</p>
  <p>LE:I need this example to be make with comboboxes. I can not use radio buttons</p>