function setCookie(key,val){
  var tmp;
  tmp = key + '=' + escape(val) + ';';
  document.cookie = tmp;
}

function deleteCookie(key,val){
  var tmp;
  tmp = key + '=' + escape(val) + ';' + 'max-age=0';
  document.cookie = tmp;
}

function getCookie(key){
  var tmp;
  tmp = document.cookie + ';';
  index1 = tmp.indexOf(key,0);
  if (index1 != -1){
    tmp = tmp.substring(index1,tmp.length);
    index2 = tmp.indexOf('=',0) + 1;
    index3 = tmp.indexOf(';',index2);
    return(unescape(tmp.substring(index2,index3)));
  }
  return('');
}