var speed = 15000
var t
var j = 0
var p = 13
var linkimage = new Array();

linkimage[0] = "images/ht_sleep.jpg"
linkimage[1] = "images/ht_sleep_2.jpg"
linkimage[2] = "images/ht_sleep_3.jpg"
linkimage[3] = "images/ht_sleep_4.jpg"
linkimage[4] = "images/ht_sleep_5.jpg"
linkimage[5] = "images/ht_sleep_6.jpg"
linkimage[6] = "images/ht_sleep_7.jpg"
linkimage[7] = "images/ht_sleep_8.jpg"
linkimage[8] = "images/ht_sleep_9.jpg"
linkimage[9] = "images/ht_sleep_10.jpg"
linkimage[10] = "images/ht_sleep_11.jpg"
linkimage[11] = "images/ht_sleep_12.jpg"
linkimage[12] = "images/ht_sleep_13.jpg"

function rotateImages()	{
  timage = document.getElementById('topic_image')
  timage.src = linkimage[j]

  j = j + 1
  if (j > (p-1)) 
	j=0
  t = setTimeout('rotateImages()', speed)
}