Manipulating "obj.style.height " Don't Work In IE7...?

I have the following function to resize a div element (Content) depending on the:

size of another div element (leftConent).

function adjustContentHeight() {
var content = document.getElementById("Content");
var leftOne = document.getElementById("leftContent ");
content.style.height = (leftOne.offsetHeight + leftOne.offsetTop) + "px";

return true;
}

This code works as expected in IE6 and FF2.0, but when testing in IE7
nothing happens... the "Content" div is not resized.