var imgs = new Array(4);
    imgs[0] = "./images/about-us-ro.png";
    imgs[1] = "./images/q-a-ro.png";
    imgs[2] = "./images/before-after-ro.png";
    imgs[3] = "./images/contact-ro.png";

function preload() {
    var tmp = null;
    for (var j = 0; j < imgs.length; j++) {
        tmp = imgs[j];
        imgs[j] = new Image();
        imgs[j].src = tmp;
    }
}

void(preload());

function swapImg(imgObj, src) {
	imgObj.src = src;
}