$(document).ready(function () {
    var imgArr = new Array( // relative paths of imag
 '/Images/home-main2.jpg',
 '/Images/home-main.jpg',
  '/Images/home-main5.jpg',
   '/Images/home-main1.jpg'

 );

    var preloadArr = new Array();
    var i;

    /* preload images */
    for (i = 0; i < imgArr.length; i++) {
        preloadArr[i] = new Image();
        preloadArr[i].src = imgArr[i];
    }

    var currImg = 1;
    var intID = setInterval(changeImg, 7500);

    /* image rotator */
    function changeImg() {
        $('#mast-head').animate({ opacity: 0 }, 2000, function () {
            $(this).css('background', 'url(' + preloadArr[currImg++ % preloadArr.length].src + ') top center no-repeat');
        }).animate({ opacity: 1 }, 3000);
    }
});