At the top of the script I have...

Code
  //Configure below to change URL path to the snow image
  var snowsrc="/index/snow.gif"



further down I use...
Code
  document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><a href=\"http://mysite.co.uk\"><img src='"+snowsrc+"' border=\"0\"><\/a><\/div>");
      } else {