function couponGiver(){
  document.getElementById('logoId').removeEventListener('onmouseover', couponGiver, false);
  var cDiv = document.createElement('div');
  cDiv.id = 'writeDiv'
  cDiv.className = 'coupon';
  document.getElementsByTagName('footer')[0].appendChild(cDiv);
  document.getElementById('writeDiv').innerHTML = "Code:C456";

}

function tableSearch(){
    var input, filter, table, tr, td, i;
    input = document.getElementById('userInput');
    filter = input.value;
    table = document.getElementById('tableSearch');
    tr = table.getElementsByTagName('tr');

    for(i = 0; i < tr.lenght; i++){
        td = tr[i].getElementsByTagName("td")[0];
        if(td){
            if(td.innerHTML.toUpperCase().indexOf(filter) > -1){
                tr[i].style.display = " ";
            } else{
                tr[i].style.display ="none";
            }
        }
    }
}