function setOptions(chosen) {
var selbox = document.preview.alternate;
 
selbox.options.length = 0;
/*if (chosen == " ") {
  selbox.options[selbox.options.length] = new 
Option('Please select one of the options above first'); 
 
} */
if (chosen == "February 28") {
  selbox.options[selbox.options.length] = new
Option('Select a date...');
  selbox.options[selbox.options.length] = new
Option('March 14');
  selbox.options[selbox.options.length] = new
Option('April 25');
  selbox.options[selbox.options.length] = new
Option('None');
}
if (chosen == "March 14") {
  selbox.options[selbox.options.length] = new
Option('Select a date...');
  selbox.options[selbox.options.length] = new
Option('February 28');
  selbox.options[selbox.options.length] = new
Option('April 25');
  selbox.options[selbox.options.length] = new
Option('None');
}
if (chosen == "April 25") {
  selbox.options[selbox.options.length] = new
Option('Select a date...');
  selbox.options[selbox.options.length] = new
Option('February 28');
  selbox.options[selbox.options.length] = new
Option('March 14');
  selbox.options[selbox.options.length] = new
Option('None');
}
}