function getImage(img) {
    image1 = new Image();
    image1.src = (img);
    sizeWindow(img);
}

function sizeWindow(img) {
    if ((image1.width != 0) && (image1.height != 0)) {
        showImage(img);
    }
    else {
        reTry = "sizeWindow('" + img + "')";
        interval = setTimeout(reTry, 20);
    }
}

function showImage(img) {
    sizeX = image1.width + 20;
    sizeY = image1.height + 20;
    var winl = (screen.width - sizeX) / 2;
    var wint = (screen.height - sizeY) / 2;
    dimension = "width=" + sizeX + ",height=" + sizeY + " ,top=" + wint + " ,left=" + winl + ", titlebar =yes";
    finalizeImage = window.open(img, "", dimension);
}