Example of a circular reference in Javascript?

Question

I was wondering if anyone has a good, working example of a circular reference in javascript? I know this is incredibly easy to do with closures, but have had a hard time wrapping my brain around this. An example that I can dissect in Firebug would be most appreciated.

Thanks

Answer 1

var b = [];
var a = [];
a[0] = b;
b[0] = a;

Printing a or b would return Circular.

Answer 2

function circular(arg){
    var count = 0;

    function next(arg){
        count++;
        if(count > 10) return;
        if(arg){
            console.log('hava arg: ' + arg);
            next();
        }else{
            console.log('no arg');
            next('add');
        }
    }
    next();
}
circular();

Circular and with a closures.