function loadTable() {
 var select = document.forms['extrasForm'].modules.options;
 var queryStr = 'id='+document.getElementById('IDNum').value;
 for (i=0; i<select.length; i++) queryStr += '&extras%5B'+i+'%5D='+select[i].value;
 if (document.getElementById('h_lec').checked == true) queryStr += '&h_lec=true';
 if (document.getElementById('h_tut').checked == true) queryStr += '&h_tut=true';
 if (document.getElementById('h_lab').checked == true) queryStr += '&h_lab=true';
 frames['tableFrame'].document.body.innerHTML='<br /><br /><br /><br /><center><span style="font-family: Optima, Sans-Serif; font-weight: bold; color: white">Loading...</span></center>';
 frames['tableFrame'].location.href='tt.php?'+queryStr;
 if (document.getElementById('options').checked == true)
  document.location.href='tt.ical.php?'+queryStr;
}
function addOption() {
 var select = document.forms['extrasForm'].modules.options;
 var module = document.forms['extrasForm'].module;
 var pattern = /[a-z]{2}[0-9]{4}/i;
 var exists = false;
 for (i=0; i<select.length; i++) if (select[i].value == module.value.toUpperCase()) exists = true;

 if (!exists) {
  if (module.value.match(pattern))
   select[select.length] = new Option(module.value.toUpperCase(), module.value.toUpperCase());
  else
   alert('invalid module code');
  }
  module.value = "";
}
function removeOptions() {
 var select = document.forms['extrasForm'].modules.options;
 for (i=select.length-1; i>=0; i--) if (select[i].selected) select[i] = null;
}