Someone

<html>
<head>
<script language="JavaScript">
function foo() {
	var myElement = document.createElement("div");
	myElement.innerHTML="<input name=\"woo\" type=\"text\" value=\"\" />";	
	myElement.setAttribute("id","test");
	document.getElementById("woo").appendChild(myElement);	
}
</script>
</head>
<body>
<form><div id="woo" style="background-color:#00FF66;"><input name="" type="text" value="la la la" /></div></form>
<hr />
<A href="javascript:void(0)" onClick="foo();">add</A>
</body>
</html>