var sign = document.getElementById('sign');
sign.style.visibility = 'hidden';
sign.style.height = "0";

var welcome = document.getElementById('welcome');

var showSign = document.createElement('a');
var text = document.createTextNode('Sign Guestbook');

var link = "javascript:showForm()";
var anchor = document.createAttribute('href');
anchor.nodeValue = link;

showSign.setAttributeNode(anchor);

showSign.appendChild(text);
welcome.insertBefore(showSign, sign);

function showForm()
{
	if(sign.style.visibility== 'hidden') {
		sign.style.visibility = "visible";
		sign.style.height = 'auto';
	} else {
		sign.style.visibility = 'hidden';
		sign.style.height = "0";
	}
}