Getting Array Of Attributes In Alert Box

I know what attributes are. But I am stuck at the attribute property. So heres what i am trying to explain : I have form with an id "form0" . Its has some attributes. So i wrote this code, pasted in address bar while the form was loaded and hit enter:
Code:
javascript: (function klo() {
var k = document.getElementById("form0");
alert(k.attributes);
})();

And I got this in alert box :
Code:
[object NamedNodeMap]
Now k in the above code is an array of attributes so basically I should be getting the array of attributes in alert box?