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Quick Data Find by Reading XML File

Example 
<html>
  <head>
    <script>
    function showCD(str) {
      if (str == '') {
        document.getElementById("txt_hint").innerHTML = '';
        return;
      } 
      if (window.XMLHttpRequest) {
        // script for browser version above IE 7 and the other popular browsers (newer browsers)
        xmlhttpreq = new XMLHttpRequest();
      } else {  
        // script for the IE 5 and 6 browsers (older versions)
        xmlhttpreq = new ActiveXObject("Microsoft.XMLHTTP");
      }
      xmlhttpreq.onreadystatechange = function() {
        //check if server response is ready  
        if (this.readyState == 4 && this.status == 200) {
          document.getElementById("txt_hint").innerHTML = this.responseText;
        }
      }
      xmlhttpreq.open("GET", "get_cd.php?q="+str, true);
      xmlhttpreq.send();
    }
    </script>
  </head>
  <body>

    <form>
      Select a CD:
      <select name="cds" onchange="show_cd(this.value)">
      <option value="">Select a CD:</option>
      <option value="Alice Cooper">Alice Cooper</option>
      <option value="John Lennon">John Lennon</option>
      <option value="Frank Zappa">Frank Zappa</option>
      </select>
    </form>
    <div id="txt_hint"><b>This is where the info about CDs goes!</b></div>

  </body>
</html>
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