letterTable='ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMabcdefghijklmnopqrstuvwxyzabcdefghijklm';
function rot13(str) {
 var outStr='';
 for (var k=0;k<str.length;k++) {
  var ch=str.charAt(k);
  var ix=letterTable.indexOf(ch);
  outStr+= (ix==-1) ? ch : letterTable.charAt(ix+13) ;
 }
 return outStr;
}
 
function SetCookie(cookieName,cookieValue,nDays) {
 var today = new Date();
 var expire = new Date();
 if (nDays==null || nDays==0) nDays=1;
 expire.setTime(today.getTime() + 3600000*24*nDays);
 document.cookie = cookieName+"="+escape(cookieValue)
                 + ";expires="+expire.toGMTString();
}