code: function(el, oRecord, oColumn, oData) {
          var bChecked = oData;
          bChecked = (bChecked) ? " checked=\"checked\"" : "";
          el.innerHTML = "<input type=\"checkbox\"" + bChecked +
                  " class=\"" + DT.CLASS_CHECKBOX + "\" />";
      }
docs: Formats a CHECKBOX element.
  
  @method DataTable.formatCheckbox
  @param el {HTMLElement} The element to format with markup.
  @param oRecord {YAHOO.widget.Record} Record instance.
  @param oColumn {YAHOO.widget.Column} Column instance.
  @param oData {Object | Boolean} Data value for the cell. Can be a simple
  Boolean to indicate whether checkbox is checked or not. Can be object literal
  {checked:bBoolean, label:sLabel}. Other forms of oData require a custom
  formatter.
  @static