randomImage(['dragon1_small.jpg','dragon2_small.jpg','engraved-group_small.jpg',
			 'frog1_small.jpg','frog2_small.jpg','koi1_small.jpg','koi2_small.jpg']);
	function randomImage(imgArr)
	{
		var imgSrc, imgW, imgH, r;
    		r = randomNumber(imgArr.length);
      		imgSrc = imgArr[r];
  		document.write('<IMG SRC=images/'+imgSrc+'>');
  	}