function randomImage(imgArr)
{
  var imgSrc, imgW, imgH, r;
  r = randomNumber(imgArr.length / 3);
  
  imgSrc = imgArr[r * 3];
  imgW = imgArr[(r * 3)+1];
  imgH = imgArr[(r * 3)+2];

  document.write("<IMG SRC='"+imgSrc+"' WIDTH='"+imgW+"' HEIGHT='"+imgH+"'>");
}
function randomNumber(limit){
  return Math.floor(Math.random()*limit);
}