function changeLink(ctrlID, linkName, indusID) {
  var indusCntl = document.getElementById(indusID);
  var indusName = indusCntl.options[indusCntl.selectedIndex].text;

  if (indusName != 'Indices') {
    var object = document.getElementById(ctrlID);
    var link = document.getElementById(linkName);
    var symName = object.options[object.selectedIndex].text;
    link.href = '/stocks-bin/stock.txt?' + symName;
    link.innerHTML = "Download " + symName;
    }
  }