java Script throgh DOM Object

I want to set the attribute 'maxlength' for my dynamically added rows. But it is not possible for me do it.
var currCell = document.createElement("TD");
var currText = document.createElement("input");
currText.setAttribute("name","mszDescription");
currText.setAttribute("type","text");
currText.setAttribute("id",currRows);
currText.setAttribute('maxlength','20');
currCell.appendChild(currText);
currRow.appendChild(currCell);
I am not able to set the maxlength attribute for dynamically added rows. All other attributes are posible to set. Please send a solution with some piece of code.