$(document).ready(function(){ 
  if($('#themes').length > 0){
    $('#themes').cycle({ fx:'none', random:1 });
  }
  showImage();
});

var imgArray = [];

function showImage()
{
  var rnd = -1;
    
  while(rnd < 0 || rnd > imgArray.length)
  {
    rnd = parseInt(imgArray.length * Math.random(),10);
  }
  if(document.getElementById("rndPhoto") != null)
  {
    document.getElementById("rndPhoto").src = imgArray[rnd];
  }
}