function rollon( )
{
    if (window.event.srcElement.tagName == 'A')
    {
        window.event.srcElement.style.color = 'red';
    }
}

function rolloff( )
{
    if (window.event.srcElement.tagName == 'A')
    {
        window.event.srcElement.style.color = '';
    }
}

document.onmouseover = rollon;
document.onmouseout = rolloff;