tooltip bodyHandler / external function

tooltip bodyHandler / external function

The code below returns:

jquery.tooltip.js (line 149)
bodyContent is undefined
error source line: if (bodyContent.nodeType || bodyContent.jquery) { 

$('td.de a', tr ).tooltip({track:true,extraClass:'de',showURL:false, bodyHandler: function() {showstuff();} });

function showstuff() {
return "hello world";
}

Am I missing something?

Thanks!