I am changing the properties of an iframe with javascript like so : 

```
var iFrame = window.top.document.getElementById('window_content');
    iFrame.setAttribute("height","63");
    iFrame.setAttribute("scrolling","no");
    iFrame.style.overflow="hidden";
    iFrame.style.height = "63px";

```

It changes size as I would like but the scrollbar will not disappear. Is this possible? The html output looks like I would expect :

```
<iframe width="650" height="63" frameborder="0" scrolling="no" src="http://www.google.com/" id="window_content" name="window_content" style="overflow: hidden; height: 63px; width: 650px;"> </iframe>

```

Why is the scrolling attribute not recognized?