function setOptions(chosen) {
var selbox = document.form1.cooperative;

selbox.options.length = 0;
if (chosen == " ") {
  selbox.options[selbox.options.length] = new Option('Please select a cooperative',' ');

}
if (chosen == "CB") {
  selbox.options[selbox.options.length] = new Option('Select Co-op','Select Co-op');
  selbox.options[selbox.options.length] = new Option('BOONE','BOONE');
  selbox.options[selbox.options.length] = new Option('BUT','BUT');
  selbox.options[selbox.options.length] = new Option('CAL','CAL');
  selbox.options[selbox.options.length] = new Option('FRA','FRA');
  selbox.options[selbox.options.length] = new Option('GRU','GRU');
  selbox.options[selbox.options.length] = new Option('HUM','HUM');
  selbox.options[selbox.options.length] = new Option('ILEC','ILEC');
  selbox.options[selbox.options.length] = new Option('MID','MID');
  selbox.options[selbox.options.length] = new Option('PRA','PRA');
  selbox.options[selbox.options.length] = new Option('RVEC','RVEC');
}
if (chosen == "CIPCO") {
  selbox.options[selbox.options.length] = new Option('Select Co-op','Select Co-op');
  selbox.options[selbox.options.length] = new Option('MID','MID');
  selbox.options[selbox.options.length] = new Option('TEST','TEST');
}
if (chosen == "NIPCO") {
  selbox.options[selbox.options.length] = new Option('Select Co-op','Select Co-op');
  selbox.options[selbox.options.length] = new Option('ILEC','ILEC');
}
}