//<script language="javascript">

function createCookie(name,value,days) {

 var expires = "";
 if (days > 0) {
  var date = new Date();
  date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
  var expires = "; expires=" + date.toGMTString();
 }
 document.cookie = name + "=" + value + expires + "; path=/";
}

function readCookie(name) {
 var nameEQ = name + "=";
 var ca = document.cookie.split(';');
 for(var i=0;i < ca.length;i++) {
  var c = ca[i];
  while (c.charAt(0)== ' ') c = c.substring(1,c.length);
  if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
 }
 return null;
}

function eraseCookie(name) {
 createCookie(name, "", -1);
}

//</script>

//example:
//createCookie('ppkcookie', 'testcookie',7)
//readCookie('ppkcookie)