EXTEND ?

I switched to using this function to create element:

----------------------------------------------------
function elem(name, attrs, style, text) {
var e = document.createElement(name);
if (attrs) {
for (key in attrs) {
if (key == 'class') {
e.className = attrs[key];
} else if (key == 'id') {
e.id = attrs[key];
} else {
e.setAttribute(key, attrs[key]);
}
}
}
if (style) {
for (key in style) {
e.style[key] = style[key];
}
}
if (text) {
e.appendChild(document.createTextNode(text));
}
return e;
}
---------------------------------------------------------

so instead of the "old" way:
var oMyDiv = document.createElement("DIV");
oMyDiv.setAttribute("id","testid");
oMyDiv.className = "testclass";

I use that function :
var oMyDiv = elem('DIV', {'id':'testid', 'class':'testclass'});

The rendered source shows this:
<div extend=" function (object) {return Object.extend.apply(this, [this,
object]); } "
class="testclass" id="testid">

Question: I don't understand the "EXTEND" part......anyways does it look
legit/right?