function returnIUMarkerImage (strImageFile) {
  return new google.maps.MarkerImage('http://www.interunis.co.uk/images/google-maps/markers/' + strImageFile,
                                     new google.maps.Size(58, 91),
                                     new google.maps.Point(0, 0),
                                     new google.maps.Point(29, 89),
                                     new google.maps.Size(58, 91));
}//function

function returnIUMarkerShadowImage () {
  return new google.maps.MarkerImage('http://www.interunis.co.uk/images/google-maps/marker-shadow.png',
                                     new google.maps.Size(101, 89),
                                     new google.maps.Point(0, 0),
                                     new google.maps.Point(29, 89),
                                     new google.maps.Size(101, 89));
}//function

function returnIUMarkerShape () {
  return {type: 'poly',
          coord: [11,3,46,3,47,4,48,4,49,5,50,6,51,7,52,8,53,9,53,10,54,11,54,46,53,47,53,48,
                  52,49,52,50,51,51,50,52,49,52,48,53,47,53,46,54,38,54,29,87,28,87,19,54,11,
                  54,10,53,9,53,8,52,7,52,6,51,5,50,5,49,4,48,4,47,3,46,3,11,4,10,4,9,5,8,6,7,
                  7,6,8,5,9,4,10,4]};
}//function