Adding a <UL> and <a>'s using the DOM (document object model)

[damasterjo]

	
HTML CODE

	<div id="nav">

	</div>

JAVASCRIPT CODE

function makeAutoLinks(){
	
	contentEdit = document.getElementById("nav");
		ul = document.createElement("ul");
		li1 = document.createElement("li");
		a1 = document.createElement("a");
		a1.setattribute('href','index.html');
		a1.appendChild(document.createTextNode('Home'));
			contentEdit.appendChild(ul);
			contentEdit.appendChild(li1);
			contentEdit.appendChild(a1);
	}

i am trying to make it where my page im working on all the links can be added dynamically so when i need to change a link on the site i dont have to change EVERY page.
www.disasterexpertsinc.com
thats the site, the news bar on the right and the stuff under the nav bar is added dynamically, i want to add the links to, the code above dosent work.

please advise what im doing wrong.

-damasterjo