function ReadCookie(cookieName) {
 var theCookie=""+document.cookie;
 var ind=theCookie.indexOf(cookieName);
 if (ind==-1 || cookieName=="") return ""; 
 var ind1=theCookie.indexOf(';',ind);
 if (ind1==-1) ind1=theCookie.length; 
 return unescape(theCookie.substring(ind+cookieName.length+1,ind1));
}

var cookie_name ="ref_cookie";
var my_cookie_value=ReadCookie(cookie_name);
//document.write(unescape(my_cookie_value));

if(my_cookie_value ==""){
my_cookie_value="";
}