title: Populating a Dropdown list in PHP dynamically
body: <p>I have a small PHP page which contains two drop down lists </p>
  <p>I need to populate the second one according to the result selected in the first drop down list .... is this possible? In other words I need to use the value selected from the first drop down list and use it in the dB query used to populate the second drop down list (but this should be populated upon selection of the first drop down list.</p>
  <p>If this is possible any hints please? (you can assume that I am able to populate the first drop down list from the dB)</p>