function swappic(imgname) {

var crossFadeDuration = 4;
var Pic = new Array();
Pic[0] = document.imagemain.src
Pic[1] = imgname
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];
if (document.all) {
document.images.imagemain.style.filter="blendTrans(duration=2)";
document.images.imagemain.style.filter="blendTrans(duration=crossFadeDuration)";
document.images.imagemain.filters.blendTrans.Apply();
}
document.images.imagemain.src = preLoad[j].src;
if (document.all) {
document.images.imagemain.filters.blendTrans.Play();
}
j = j + 1;
if (j > (p - 1)) j = 0;
}}