Getting A Method's Name

Here's my situation. I have an object:

function Obj () {
this.foo = null;
}

a function
function bar() {...}

another function

function doSomething () {
var obj = new Obj();
obj.foo = bar;
doSomethingElse(obj);
}

In function doSomethingElse I want to create the following line of DHTML

<div return true;">

What I want is for onClick to be defined to be the execution of the foo
method of obj.

I tried document.writeln ("<div + obj.foo + "(); return
true;'>");

What I get is the source code for bar stuck into the middle of the string.
So how do I get just the name of the function bar in the string? Or
ultimately, how do I get the handler to be bar in the DHTML?