function getLeadInstructor(m, courseData)
{
  // Input: m = collection of all 'member" elements from FacultyStaffInfoAll XML file; courseData = one 'course' node from CourseInfoAll XML file corresponding to desired course
  var i;
  for (i = 0;  i < m.length;  i++)
  {
    if( m[i].getElementsByTagName('unique_ID')[0].childNodes[0].nodeValue == courseData.getElementsByTagName('lead_inst_uid')[0].childNodes[0].nodeValue )
    {
      return m[i];
    }
  }
  // function returns nothing if it can't find a lead instructor with a matching unique ID
}