function checkCookie()
{
referredby=getCookie('referredby');
if (referredby!=null && referredby!="")
  {
  }
  else
  {
  referredby=document.referrer;
  setCookie('referredby',referredby,30);
  }
  
  if( (document) && (document.getElementById("refvalue")) )
  
  {
   var x=document.getElementById("refvalue");
   x.value=referredby;
  }
}

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 setCookie(c_name,value,expiredays)
{
var exdate=new Date();
exdate.setDate(exdate.getDate()+expiredays);
document.cookie=c_name+ "=" +escape(value)+
((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
}