function setClassById(id, className)
{
    theElement = document.getElementById(id);
    if (theElement)
    {
        theElement.className = className;
    }
}

function setStyleById(id, styleName, styleValue)
{
    theElement = document.getElementById(id);
    if (theElement)
    {
        theElement.style[styleName] = styleValue;
    }
}