var exdate=new Date();
var deldate=new Date();
exdate.setDate(exdate.getDate()+1);
deldate.setDate(deldate.getDate()-1);
function getCookie(c_name)
{
if (document.cookie.length>0)
  {
  c_start=document.cookie.indexOf(c_name + "=");
  if (c_start!=-1)
    {
    c_start=c_start + c_name.length+1;
    c_end=document.cookie.indexOf(";",c_start);
    if (c_end==-1) c_end=document.cookie.length;
    return unescape(document.cookie.substring(c_start,c_end));
    }
  }
return "";
}
function read_cookie(){
if (getCookie(cookiename)){
		settings = getCookie(cookiename).evalJSON(true);
	}
}
function clear_cookie(){
if (getCookie(cookiename)){
		settings = getCookie(cookiename).evalJSON(true);
		document.cookie=cookiename+"=0;expires="+deldate.toUTCString()+";path=/";			
	}
}
function write_cookie(){
	var string_settings = Object.toJSON(settings)
	document.cookie=cookiename+"="+escape(string_settings)+";expires="+exdate.toUTCString()+";path=/";		
}
read_cookie();