// functions mainly from www.quirksmode.org
var lifetime=30*24*60*60*1000;

function createCookie(name,value){
 var date=new Date();
 date.setTime(date.getTime()+lifetime);
 document.cookie=name+"="+value+";expires="+date.toGMTString()+"; path=/";
}

function readCookie(name){
 name+="=";
 var ca=document.cookie.split(';');
 for(var i=0; i<ca.length; i++){
  var c=ca[i];
  while(c.charAt(0)==' ') c=c.substring(1,c.length);
  if(c.indexOf(name)==0) return c.substring(name.length,c.length);
 }
 return null;
}