function SetOpacity(elem, opacityAsInt) {
    var opacityAsDecimal = opacityAsInt;

    if (opacityAsInt > 100)
        opacityAsInt = opacityAsDecimal = 100;
    else if (opacityAsInt < 0)
        opacityAsInt = opacityAsDecimal = 0;

    opacityAsDecimal /= 100;
    if (opacityAsInt < 1)
        opacityAsInt = 1; // IE7 bug, text smoothing cuts out if 0
    if ( elem != null) {
        elem.style.opacity = opacityAsDecimal;
        elem.style.filter = "alpha(opacity=" + opacityAsInt + ")";
    }
}

function FadeOpacity(elemId, fromOpacity, toOpacity, time, fps)
{
	var steps = Math.ceil(fps * (time / 1000));
	var delta = (toOpacity - fromOpacity) / steps;
	
	FadeOpacityStep(elemId, 0, steps, fromOpacity, delta, (time / steps));
}

function FadeOpacityStep(elemId, stepNum, steps, fromOpacity, delta, timePerStep)
{
  //  SetOpacity(document.getElementById(elemId), Math.round(parseInt(fromOpacity) + (delta * stepNum)));
    SetOpacity(Get(elemId), Math.round(parseInt(fromOpacity) + (delta * stepNum)));
    if (stepNum < steps)
        setTimeout("FadeOpacityStep('" + elemId + "', " + (stepNum+1) + ", " + steps + ", " + fromOpacity + ", " + delta + ", " + timePerStep + ");", timePerStep);
}