function image() { }; 
image = new image();
number = 0; 
// imageArray
image[number++] = "<a href='http://commentarius.co.uk/content/commentarius-rinuccinianus-de-sedis-apostolicae-legatione-ad-foederatos-hiberniae-catholicos'><img src='http://irith.org/images/home/Commentarius_Rinuccinianus.png' alt='Commentarius Rinuccinianus Archive'/></a>"
image[number++] = "<a href='http://www.nli.ie/'><img src='http://irith.org/images/home/four_courts.jpg' alt='National Library of Ireland Photograph Collection'/></a>"
image[number++] = "<a href='http://www.cbl.ie/'><img src='http://irith.org/images/home/chester_beaty.png' alt='Chester Beatty Library' /></a>"
image[number++] = "<a href='http://www.nli.ie/yeats/'><img src='http://irith.org/images/home/yeats.png' alt='National Library of Ireland Yeats Online' /></a>"
image[number++] = "<a href='http://www.nli.ie/1916/'><img src='http://irith.org/images/home/dublin.png' alt='National Library of Ireland 1916' /></a>" 
image[number++] = "<a href='http://www.belfastfestival.com/'><img src='http://irith.org/images/home/festival_at_queens.jpg' alt='Festival at Queens' /></a>" 
image[number++] = "<a href='http://comhaltas.ie/index.htm'><img src='http://irith.org/images/home/comhaltas.jpg' alt='Comhaltas' /></a>"
image[number++] = "<a href='http://www.census.nationalarchives.ie/' <img src='http://irith.org/images/home/census.png' alt='Census of Ireland Project' /></a>" 
image[number++] = "<a href='http://www.centreforcinemastudies.com/irish_genres.shtml'><img src='http://irith.org/images/home/film_institute.png' alt='Centre for Cineam Studies ' /></a>"
increment = Math.floor(Math.random() * number);  document.write(image[increment]);