function cookieset(cookieValue) {
var today = new Date();
var expire = new Date();
var nDays=1;
expire.setTime(today.getTime() + 3600000*24*nDays);
document.cookie = "bgset="+escape(cookieValue)
                 + ";expires="+expire.toGMTString();

	if(getCookie('bgset') != "summberbg")
	{
			document.getElementById("mainDiv").style.backgroundImage = 'url(/lib/public/rjukan-hytteby-bg-summer.jpg)';
						
	}
	else
	{
			document.getElementById("mainDiv").style.backgroundImage = 'url(/lib/public/rjukan-hytteby-bg-winter.jpg)';
	}
}
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 "";
}