How do I select all table rows using a checkbox in the header using Jquery datatable tabletools?

One way would be to use the aoColumns property of datatables and just render your markup for the "sTitle" property as an html string.

http://www.datatables.net/usage/columns

//On datatable init the options would look something like this
"aoColumns": [{   "sTitle": "<input type='checkbox' id='selectAll'></input>"}]
Then you could just wire up a handler to the header checkbox after the datatable is created to check/uncheck all the checkboxes;

So something like:

$("#selectAll").toggle(function () {
       $("checkboxSelector", dataTable.fnGetNodes()).attr("checked", true); }
     , function () {
         $("checkboxSelector", dataTable.fnGetNodes()).attr("checked", false);
     }
 );