// Set cookies
function setCookie(cname,cvalue,exdays) {
  var d = new Date();
  d.setTime(d.getTime()+(exdays*24*60*60*1000));
  var expires = "expires="+d.toGMTString();
  document.cookie = cname + "=" + cvalue + "; " + expires;
}
function getCookie(cname) {
  var name = cname + "=";
  var ca = document.cookie.split(';');
  for(var i=0; i<ca.length; i++)  {
    var c = ca[i].trim();
    if (c.indexOf(name)==0) return c.substring(name.length,c.length);
  }
  return "";
}


function START() {
  setCookie("ie",'user1',30);
  //var urlp =document.getElementById('download_pdf');
  //window.location.href= urlp;
}

function READ(user) {
  var user=getCookie("ie");
  if (user!="") {
    alert("Welcome again " + user);
  } else {
    START();
  }
}

READ('stackoverflow');