preload();

function replaceme(which, img) {
    //alert("replaceme");
    which.src = img;
}

function preload() {
    // create object
    var imageObj = new Image();

    // set image list
    var images = [
                  "images/Imp.png",
                  "update_corner.png",
                  "imp_title_font.png",
                  "imp_content_frames.jpg",
                  "gimpse_of_imp.jpg"
                  ]

    // start preloading
    for(var i = 0; i < images.length; i++) {
        imageObj.src = images[i];
    }
}