oop - Preserve 'this' reference in javascript prototype event handler

What is the correct way to preserve a this
javascript reference in an event handler stored inside the object's prototype? I'd like
to stay away from creating temp vars like '_this' or 'that' and I can't use a framework
like jQuery. I saw a lot of people talk about using a 'bind' function but was unsure of
how to implement it in my given
scenario.

var Example =
            function(foo,bar){
 this.foo = foo;
 this.bar =
            bar;
};
Example.prototype.SetEvent = function(){

            this.bar.onclick = this.ClickEvent;
};
Example.prototype.ClickEvent
            = function(){
 console.log(this.foo); // logs undefined because 'this' is
            really 'this.bar'

};

Answer

I find bind() being
the cleanest solution so
far:

this.bar.onclick =
            this.ClickEvent.bind(this);

BTW
the other this is called
that by convention very often.