var coding = 'ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMabcdefghijklmnopqrstuvwxyzabcdefghijklm';

function rot13(input) {
    if (!input) return '';
    for (var output = '',i=0;i<input.length;i++) {
        character = input.charAt(i);
        position = coding.indexOf(character);
        if (position > -1)
            character = coding.charAt(position + 13);
        output += character;
    }
    return output;
}

function Get_Cookie(name) {
   var start = document.cookie.indexOf(name+"=");
    var len = start+name.length+1;
    if ((!start) && (name != document.cookie.substring(0,name.length))) return null;
    if (start == -1) return null;
    var end = document.cookie.indexOf(";",len);
    if (end == -1) end = document.cookie.length;
    return unescape(document.cookie.substring(len,end));
}
 
function Set_Cookie(name,value,expires,path,domain,secure) {
   document.cookie = name + "=" +escape(value) +
        ( (expires) ? ";expires=" + expires.toGMTString() : "") +
        ( (path) ? ";path=" + path : ";path=/") + 
        ( (domain) ? ";domain=" + domain : "") +
        ( (secure) ? ";secure" : "");
} 


// ----------------------------------------------------- //
// Codigo usado para setear una COOKIE UNICA por usuario //
// ----------------------------------------------------- //
   var caution = false
   function setCookie(name, value, expires, path, domain, secure) {
      var curCookie = name + "=" + escape(value) +
         ((expires) ? "; expires=" + expires.toGMTString() : "") +
         ((path) ? "; path=" + path : "") +
         ((domain) ? "; domain=" + domain : "") +
         ((secure) ? "; secure" : "")
      if (!caution || (name + "=" + escape(value)).length <= 4000)
         document.cookie = curCookie
      else
         if (confirm("Cookie exceeds 4KB and will be cut!"))
            document.cookie = curCookie
   }

   function getCookie(name) {
      var prefix = name + "="
      var cookieStartIndex = document.cookie.indexOf(prefix)
      if (cookieStartIndex == -1)
         return null
      var cookieEndIndex = document.cookie.indexOf(";", cookieStartIndex +
         prefix.length)
      if (cookieEndIndex == -1)
         cookieEndIndex = document.cookie.length
      return unescape(document.cookie.substring(cookieStartIndex +
         prefix.length,
   cookieEndIndex))
   }

  function deleteCookie(name, path, domain) {
      if (getCookie(name)) {
         document.cookie = name + "=" +
         ((path) ? "; path=" + path : "") +
         ((domain) ? "; domain=" + domain : "") +
         "; expires=Thu, 01-Jan-70 00:00:01 GMT"
      }
   }

   function fixDate(date) {
      var base = new Date(0)
      var skew = base.getTime()
      if (skew > 0)
         date.setTime(date.getTime() - skew)
   }

   function getRandom() {
   return Math.round(1000000*Math.random())
   }

   var now = new Date()
   fixDate(now)
   now.setTime(now.getTime() + 5 * 365 * 24 * 60 * 60 * 1000)
   var id = getCookie("id_gemelo")
   if (!id) {
      id="user_" + now.getTime() + "_id_" + getRandom()
      setCookie("id_gemelo", id, now,"/")
   }
// ----------------------------------------------------- //