Javasctipt Problem with creating elements and appending everything

Hello:
I,m trying to write some code to create a a div with a class and and id. I believe I have that part correct, I then create a <p> element, I then create a text node to go inside the tag the issue is trying to append everything.
This is what I'm trying to do
var element = document.getElementsByClassName("creditCardSummary");

var parent= element.parentNode;

//create div

var newDiv = document.createElement("div");
newDiv.id "newcc";
newDiv.className = "creditCardSummaryWrapper";

//Create a paragraph tag
var para = document.createElement("p");
alert("here")
var node=document.createTextNode("CardNumber:cshadow Experation:monthyear");

//The monthyear and cshadow are variables that hold information I
//captured from a form successfully.

para.appendChild(node);

I can't figure out out how to append all this so div , class, id p and text show up.

This is really complicated I tried something like
parent.insertAfter(element, para); //I know something is missing.

Your help is greatly appreciated, thanks in advance
PH