/* easy_captcha utility code */

// global vars
captcha_url_rx = /(https?:\/\/\w[^\/,\]\[=#]+)/ig;  //   
captcha_form_urls = new Array();
captcha_sol_cb = "";
captcha_rpc = 0;

// set up watchers
if (0) {
  window.setTimeout("captcha_form_urls = captcha_find_urls_in_form()", 500);
  window.setInterval("captcha_spamfree_no_new_urls()", 3000);
}

// scans for URLs in any of the form fields
function captcha_find_urls_in_form() {
   var nf, ne, nv;
   for (nf=0; nf<document.forms.length; nf++) {
      for (ne=0; ne<document.forms[nf].elements.length; ne++) {
         nv += "\n" + document.forms[nf].elements[ne].value;
      }
   }
   var r = nv.match(captcha_url_rx);
   if (!r) { r = new Array(); }
   return r;
}
// diff URL lists and hide captcha if nothing new was entered
function captcha_spamfree_no_new_urls() {
   var has_new_urls = captcha_find_urls_in_form().join(",") != captcha_form_urls.join(",");
   var s = document.getElementById("captcha").style;
   if (s.opacity) {
      s.opacity = has_new_urls ? "0.9" : "0.1";
   }
   else {
      s.display = has_new_urls ? "block" : "none";
   }
}

// if a certain solution length is reached, check it remotely (JS-RPC)
function captcha_check_solution() {
   var cid = document.getElementById("__ec_i");
   var inf = document.getElementById("__ec_s");
   var len = inf.value.length;
   // visualize processissing
   if (len >= 4) {
      inf.style.border = "1px solid #FF9955";
   }
   // if enough letters entered
   if (len >= 5) {
      // remove old <script> node
      var scr;
      if (src = document.getElementById("captcha_ajax_1")) {
         src.parentNode.removeChild(src);
      }
      // create new <script> node, initiate JS-RPC call thereby
      scr = document.createElement("script");
      scr.setAttribute("language", "JavaScript");
      scr.setAttribute("type", "text/javascript");
      scr.setAttribute("src", "http://www.holz-schlitten.de:80//sys/external/captcha/captcha.php" + "?__ec_i=" + cid.value + "&__ec_s=" + inf.value);
      scr.setAttribute("id", "captcha_ajax_1");
      document.getElementById("captcha").appendChild(scr);
      captcha_rpc = 1;
   }
   // visual feedback for editing
   var col = 10 + len*3;
   //inf.style.background = "#"+col+col+col;
}