title: Change the value of combo box of other combo box using Javascript
body: <p>I have two combo boxes in a form. The 1st combo box: type of position hiring while the 2nd combo box: location. The values of two combo boxes are dynamically populated from mysql</p>
  
  <p>I need to change the value of 2nd combo box. If the value of 1st combo box change to "Linux Admin", the value of 2nd combo box should display the designated locations depends on the value of 1st combo box.</p>
  
  <p>I found with the same function, but the values are manually populated <a href="https://stackoverflow.com/questions/6211929/javascript-combobox-change-value-of-other-combobox">Javascript - combobox change value of other combobox</a></p>