function randomImage() {var headImages = new Array(
'http://www.nuigalway.ie/images/headers/galway/91.jpg',
'http://www.nuigalway.ie/images/headers/galway/87.jpg',
'http://www.nuigalway.ie/images/headers/galway/46.jpg',
'http://www.nuigalway.ie/images/headers/galway/78.jpg',
'http://www.nuigalway.ie/images/headers/galway/89.jpg',
'http://www.nuigalway.ie/images/headers/galway/49.jpg',
'http://www.nuigalway.ie/images/headers/galway/88.jpg',
'http://www.nuigalway.ie/images/headers/students/9.jpg',
'http://www.nuigalway.ie/images/headers/students/1.jpg',
'http://www.nuigalway.ie/images/headers/students/22.jpg',
'http://www.nuigalway.ie/images/headers/students/13.jpg',
'http://www.nuigalway.ie/images/headers/students/86.jpg',
'http://www.nuigalway.ie/images/headers/students/2.jpg',
'http://www.nuigalway.ie/images/headers/students/21.jpg',
'http://www.nuigalway.ie/images/headers/students/90.jpg',
'http://www.nuigalway.ie/images/headers/students/38.jpg',
'http://www.nuigalway.ie/images/headers/students/3.jpg',
'http://www.nuigalway.ie/images/headers/students/15.jpg',
'http://www.nuigalway.ie/images/headers/students/39.jpg',
'http://www.nuigalway.ie/images/headers/students/40.jpg',
'http://www.nuigalway.ie/images/headers/students/7.jpg',
'http://www.nuigalway.ie/images/headers/students/44.jpg',
'http://www.nuigalway.ie/images/headers/buildings/1.jpg'
);
var max = headImages.length -1;
var num = Math.floor((Math.random() * max));
if (document.getElementById) {
  var headerImageDiv = document.getElementById('image');
  if (headerImageDiv) {
    headerImageDiv.style.backgroundImage = "url(" + headImages[num] + ")";
  }
}
return;
}