// Function that return a number between 0 and "nums - 1"
      function getRandom(nums)
        {
          var ranNum= Math.round(Math.random()*nums);
          return ranNum;
        }

      // Tells us how many images we have available.
      var numberOfimages = 18;
      var randomNumber = getRandom(numberOfimages);

      // Create an array to hold the names of all images.
      var images = new Array()

      images[0]="<img src=\"home-page.png\" alt=\"Making Music: North East\" />"
      images[1]="<img src=\"home-dur.png\" alt=\"Making Music: North East\" />"
      images[2]="<img src=\"home-monk.png\" alt=\"Making Music: North East\" />"
      images[3]="<img src=\"home-gate.png\" alt=\"Making Music: North East\" />"
      images[4]="<img src=\"home-aln.png\" alt=\"Making Music: North East\" />"
      images[5]="<img src=\"home-bamb.png\" alt=\"Making Music: North East\" />"
      images[6]="<img src=\"home-tran.png\" alt=\"Making Music: North East\" />"
      images[7]="<img src=\"home-sage.png\" alt=\"Making Music: North East\" />"
      images[8]="<img src=\"home-emp.png\" alt=\"Making Music: North East\" />"
      images[9]="<img src=\"home-sun.png\" alt=\"Making Music: North East\" />"
      images[10]="<img src=\"home-hol.png\" alt=\"Making Music: North East\" />"
      images[11]="<img src=\"home-high.png\" alt=\"Making Music: North East\" />"
      images[12]="<img src=\"home-gui.png\" alt=\"Making Music: North East\" />"
      images[13]="<img src=\"home-grey.png\" alt=\"Making Music: North East\" />"
      images[14]="<img src=\"home-dur1.png\" alt=\"Making Music: North East\" />"
      images[15]="<img src=\"home-cra.png\" alt=\"Making Music: North East\" />"
      images[16]="<img src=\"home-train.png\" alt=\"Making Music: North East\" />"
      images[17]="<img src=\"home-balt.png\" alt=\"Making Music: North East\" />"

      document.write(images[randomNumber]);