JAVA SCRIPT - DYNAMIC TABLE

    function addEventPresentRow() {
 var row = document.createElement("tr");
 var cell = document.createElement("td");
 var cell2 = document.createElement("td");
  
 var input = document.createElement("input");
 input.setAttribute("type", "text");
 input.setAttribute("name", "present");
  
 var button = document.createElement('input');
 if(button.getAttribute('onclick')){ //else IE 
      button.setAttribute('onclick','delRow(this)');
 } else{ //IE
     button = document.createElement("<input onclick=\"delRow(this)                     \">");
 }
 button.setAttribute("type", "button");
 button.setAttribute("value", "-");
  
 cell.appendChild(input);
 row.appendChild(cell);
 cell2.appendChild(button);
 row.appendChild(cell2);
  
 document.getElementById("targetBody").appendChild(row);
    }

 
    function delEventPresentRow(buttonObj) {
 var tableBody = document.getElementById("targetBody");
 var index = buttonObj.parentElement.parentElement.rowIndex;
 tableBody.removeChild(tableBody.childNodes[index]);
    }