// Declare a global variable
var i = 0;
var delayTime = 4000;
var fadeTime = 1000;
var interval = 3 * delayTime;

//Set my function
function rotation() {
    //Declare my array
    var img = new Array();
    img[img.length] = '/docs/vt/home_1.jpg';
    img[img.length] = '/docs/vt/home_2.jpg';

    $("#tImg").attr("src", img[i]).fadeIn(fadeTime, function () { i = (i == (img.length - 1)) ? i = 0 : i + 1; $("#bImg").attr("src", img[i]).show() }).delay(delayTime).fadeOut(fadeTime, function () { i = (i == (img.length - 1)) ? i = 0 : i + 1; }).delay(delayTime);
}

$(document).ready(function () {
    rotation();
    setInterval('rotation()', interval);
});