function get_random(number)
   { 
      return Math.floor(Math.random() * number); 
   }

   function random_building()
   {    
      var buildingc = 6;
      var buildings = new Array(buildingc);
    
      buildings[0] = "images/buildings/barn.jpg";
      buildings[1] = "images/buildings/park.jpg";
      buildings[2] = "images/buildings/tower.jpg";
      buildings[3] = "images/buildings/woodshed.jpg";
      buildings[4] = "images/buildings/courthouse.jpg";
      buildings[5] = "images/buildings/houses.jpg";

      var choice = get_random(buildingc);
      document.writeln('<img id="building" alt="asssville building" src="' + buildings[choice] + '" />');
   }