Web Forms :: Setting The Width With ResizeDiv?

I have a silverlight project that I need to resize the width.

What I need to do is have horizontal scrollbars appear when a user shrinks the browser's width to less than the page width of the app.

I've been pointed to the ResizeDiv function in my test page:

function ResizeDiv(height) {
var x = document.getElementById("silverlightControlHost");
x.style.height = height;
}

but I don't know what to do here. I've set the width to different values (x.style.width = 100) but that just chops the page.

Is this the right function/page to do this? What do I need to do to get horizontal scroll bars to kick in if the browser is smaller than the page?