function change_image() {
    // loads new captcha image if they can't read the current one
    if(document.getElementById) {
        // extract image name from image source (i.e. cut off ?randomness)
        thesrc = document.getElementById("freecap").src;
        thesrc = thesrc.substring(0,thesrc.lastIndexOf(".")+4);
        // add ?(random) to prevent browser/isp caching
        document.getElementById("freecap").src = thesrc+"?"+Math.round(Math.random()*100000);
    } else {
        alert("Sorry, cannot autoreload captcha image\nSubmit the form and a new image will be loaded");
   }
}