Hide show -javascript

var ecsd = document.getElementById("shoyeb");
    ecsd.style.display = 'block';

ecsd.onclick = function() {
    ecsd.style.display = 'none';
}

/*+++++++++++++++++++++++++++++*/

var ecsd = document.getElementById("couponid");
    //ecsd.style.display = 'block';
    //ecsd.setAttribute("class", "couponshow");
    ecsd.classList.add("couponshow", "coupon");

ecsd.onclick = function() {
    //this.classList.remove("couponshow");
    //alert("clicked");
    ecsd.className ="";
}