function AdRotator(imgTagNameAttribute, adURLs, adImageURLs, rotationTime,

   adRotatorVarName) {

  this.imgTagNameAttribute = imgTagNameAttribute

  this.adURLs = adURLs

  this.adImageURLs = adImageURLs

  this.rotationTime = rotationTime

  this.adRotatorVarName = adRotatorVarName

  this.index = 0

  this.adImages = new Array(adImageURLs.length)

  for(var i=0; i<adImageURLs.length; ++i) {

   this.adImages[i] = new Image()

   this.adImages[i].src = adImageURLs[i]

  }

  this.writeHTML = AdRotator_writeHTML

  this.start = AdRotator_start

  this.rotate = AdRotator_rotate

  this.handleClick = AdRotator_handleClick

 }



 function AdRotator_writeHTML() {

  document.write('<p align="center">')

  document.write('<a href="javascript:void(0)" ')

  document.write('onclick="'+this.adRotatorVarName+'.handleClick()">')

  document.write('<img name="'+this.imgTagNameAttribute+'" border="0" ')

  document.write('src="'+this.adImageURLs[0]+'">')

  document.write('</a></P>')

 }



 function AdRotator_start() {

  window.setInterval(this.adRotatorVarName + '.rotate()', this.rotationTime)

 }



 function AdRotator_rotate() {

  ++this.index

  this.index %= this.adImageURLs.length

  document.images[this.imgTagNameAttribute].src = this.adImages[this.index].src

 }



 function AdRotator_handleClick() {

  setTimeout("window.location.href = '"+this.adURLs[this.index]+"'",500)

 }