function setOptions(chosen) {
var selbox = document.myform.control1;
var col2 = document.myform.col2;

selbox.options.length = 0;
if (chosen == " ") {
}
if (chosen == "domain") {
  selbox.options[selbox.options.length] = new Option('Begins with','oneone');
  selbox.options[selbox.options.length] = new Option('Ends with (.com, .net, etc.)','onetwo');
  selbox.options[selbox.options.length] = new Option('Contains','onethree');
  col2.style.visibility="visible";
}
if (chosen == "pr") {
  selbox.options[selbox.options.length] = new Option('Equals','twoone');
  selbox.options[selbox.options.length] = new Option('Is Greater Than','twotwo');
  selbox.options[selbox.options.length] = new Option('Is Less Than','twothree');
  col2.style.visibility="visible";
}
if (chosen == "ylinks") {
  selbox.options[selbox.options.length] = new Option('Equals','threeone');
  selbox.options[selbox.options.length] = new Option('Is greater than','threetwo');
  selbox.options[selbox.options.length] = new Option('Is less than','threethree');
  col2.style.visibility="visible";
}
if (chosen == "expdate") {
  selbox.options[selbox.options.length] = new Option('In the next ... days','fourone');
  selbox.options[selbox.options.length] = new Option('Specific date (YYYY-MM-DD)','fourtwo');
  col2.style.visibility="visible";
}
if (chosen == "regdate") {
  selbox.options[selbox.options.length] = new Option('In the last ... days','fiveone');
  selbox.options[selbox.options.length] = new Option('Specific date (YYYY-MM-DD)','fivetwo');
  col2.style.visibility="visible";
}
if (chosen == "registrar") {
  selbox.options[selbox.options.length] = new Option('Begins with','sixone');
  selbox.options[selbox.options.length] = new Option('Is','sixtwo');
  selbox.options[selbox.options.length] = new Option('Contains','sixthree');
  col2.style.visibility="visible";
}
if (chosen == "ns1") {
  selbox.options[selbox.options.length] = new Option('Begins with','sevenone');
  selbox.options[selbox.options.length] = new Option('Is','seventwo');
  selbox.options[selbox.options.length] = new Option('Contains','seventhree');
  col2.style.visibility="visible";
}
if (chosen == "ip") {
  selbox.options[selbox.options.length] = new Option('Begins with','eightone');
  selbox.options[selbox.options.length] = new Option('Ends with','eighttwo');
  selbox.options[selbox.options.length] = new Option('Is','eightthree');
  selbox.options[selbox.options.length] = new Option('Contains','eightfour');
  col2.style.visibility="visible";
}
}