var slideShowSpeed = 3500 /*ここで写真の切り替えタイミング*/ 
var crossFadeDuration = 4  /*わからん*/ 
var Pic = new Array()
Pic[0] = 'pict/top_mainimage1.jpg'
Pic[1] = 'pict/top_mainimage2.jpg'
Pic[2] = 'pict/top_mainimage3.jpg'
var t
var j = 0
var p = Pic.length

var preLoad = new Array()
for (i = 0; i < p; i++){
   preLoad[i] = new Image()
   preLoad[i].src = Pic[i]
}

function runSlideShow(){
   if (document.all){
      document.images.SlideShow.style.filter='blendTrans(duration=2)'
      document.images.SlideShow.style.filter='blendTrans(duration=crossFadeDuration)'
      document.images.SlideShow.filters.blendTrans.Apply()      
   }
   document.images.SlideShow.src = preLoad[j].src
   if (document.all){
      document.images.SlideShow.filters.blendTrans.Play()
   }
   j = j + 1
   if (j > (p-1)) j=0
   t = setTimeout('runSlideShow()', slideShowSpeed)
}