function imagechange1(){
var startImage = document.images['illust'].src;
var endImage = "illust2.gif";

imgObj.filters[0].apply();
if (oImg.src.indexOf(startImage)!=-1) {
  oImg.src = endImage;
}
else {
  oImg.src = startImage;
}
imgObj.filters[0].play();
setTimeout( "imagechange2();" , 5000 );
}




function imagechange2(){
var startImage = document.images['illust'].src;
var endImage = "illust1.gif";

imgObj.filters[0].apply();
if (oImg.src.indexOf(startImage)!=-1) {
  oImg.src = endImage;
}
else {
  oImg.src = startImage;
}
imgObj.filters[0].play();
}