function play(){
    timer=setInterval(next,2000);
}



var slide = new Array;
var pictureName = new Array("im/p01.jpg", "im/p02.jpg", "im/p03.jpg", "im/p04.jpg","im/p05.jpg");

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

slide[i] = new Image();
slide[i].src = pictureName[i];
}

var m = new Array(0, 100);
var nextImage = 0;
var t = "";


function next() {
var step=1;

if (t != "") return;

m[0] = 0;
m[1] = 100;

nextImage = nextImage + step;

if (nextImage == pictureName.length) {

nextImage = 0;
} 

if (nextImage == -1) {

nextImage = pictureName.length - 1;
} 


document.getElementById("after").src = slide[nextImage].src;

change_slide();

}

function change_slide() {

m[0] += 1;
m[1] -= 1;

document.getElementById("before_div").style.opacity = m[1]/100;
document.getElementById("after_div").style.opacity = m[0]/100;
document.getElementById("after_div").style.filter="alpha(opacity="+m[0]+")";
document.getElementById("before_div").style.filter="alpha(opacity="+m[1]+")";

t = setTimeout("change_slide()",5);
if (m[0] > 98) {

clearTimeout(t);
document.getElementById("before").src = slide[nextImage].src;
document.getElementById("before_div").style.opacity = 100;
document.getElementById("before_div").style.filter="alpha(opacity=0)";
t = "";
}

}