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 null
}

function setCookie(c_name, value, expiredays){
  var exdate = new Date()
  exdate.setTime(exdate.getTime() + (expiredays * 24 * 3600 * 1000))
  document.cookie = c_name+ "=" + escape(value) + ((expiredays == null) ? "" : "; expires=" + exdate)
}

function checkCookie(){
  var exdate = new Date()
  cookie = getCookie('katalogerna')
  if (cookie == null){
    cookie = exdate.getTime() + (Math.random() * 65536)
    setCookie('katalogerna', cookie, 365*3)
  }
}