function CenterLegend()
{
    if (document.getElementsByTagName)
    {
        var oFS = document.getElementsByTagName('fieldset');
        
        if (oFS)
        {
            var oLegend = document.getElementsByTagName('legend');
            
            if (oLegend.length)
            {
                oLegend[0].style.marginLeft = (oFS[0].offsetWidth - oLegend[0].offsetWidth) / 2 + 'px';
            }
        }
    }
}

window.addEvent('domready', function() {
    CenterLegend();
});