iframe targeting ( Help! )

[gantonet]

IE6 et Firebird0.7

I want to scroll the content of an iframe window from the main window. I have no control over the content of the iframe window.

<script>
function scrolliframecontent()
{
document.getElementById('theframe').scrollby(10,10);
}
</script>

<iframe id="theframe" src="uncontrolledcontent.htm" onload="scrolliframecontent()">
</iframe>

Thanks in advance