marque_right = 0;
left = 0;
diff = 2;

$(document).ready( function()
{
    setMarqueRight();

    marque_right_anim();
});

function setMarqueRight() {
    p_breite = $('#dd-marque p').width();
    marque_right = 970 - p_breite;
}

function marque_right_anim()
{
    if( left < 10)
    {
        diff = +2;
    }
    if( marque_right < left)
    {
        diff = -2;
    }
    
    left += diff;
    $('#dd-marque p').animate(
        {left: left},
        50,
        function() {
            marque_right_anim();
        }
    );
}