onResize not working with Firefox

[KevinHall]

I'm using javascript to equalise the height of 2 columns so I can place a footer below them.
The script I use works perfectly in IE, it works in Firefox when the page is first loaded, but if the window is resized it doesn't.
Can anyone help?

This is the script I'm using.

[code]function setTall() {
    if (document.getElementById) {
        // the divs array contains references to each column's div element.  
        // Replace 'center' 'right' and 'left' with your own.  
        // Or remove the last one entirely if you've got 2 columns.  Or add another if you've got 4!
        var divs = new Array(document.getElementById('c1'), document.getElementById('c2'));
        
        // Let's determine the maximum height out of all columns specified
        var maxHeight = 0;
        for (var i = 0; i < divs.length; i++) {
            if (divs[i].offsetHeight > maxHeight) maxHeight = divs[i].offsetHeight;
        }
        
        // Let's set all columns to that maximum height
        for (var i = 0; i < divs.length; i++) {
            divs[i].style.height = maxHeight + 'px';

            // Now, if the browser's in standards-compliant mode, the height property
            // sets the height excluding padding, so we figure the padding out by subtracting the
            // old maxHeight from the new offsetHeight, and compensate!  So it works in Safari AND in IE 5.x
            if (divs[i].offsetHeight > maxHeight) {
                divs[i].style.height = (maxHeight - (divs[i].offsetHeight - maxHeight)) + 'px';
            }
        }
    }
}

onload = function() {
    setTall();
}

window.onResize = function() {
    setTall();
}[/code]

Thanks in advance.