randomImage(['1_small.jpg','2_small.jpg','3_small.jpg','4_small.jpg','5_small.jpg','6_small.jpg',
	'7_small.jpg','8_small.jpg','9_small.jpg','10_small.jpg','11_small.jpg','12_small.jpg',
	'13_small.jpg','14_small.jpg','15_small.jpg']);
	function randomImage(imgArr)
	{
		var imgSrc, imgW, imgH, r;
    		r = randomNumber(imgArr.length);
      		imgSrc = imgArr[r];
  		document.write('<IMG SRC=images/'+imgSrc+'>');
  	}