function DOMCall( id )
{
    if ( document.layers ) {
        return document.layers[ id ];
    }
    else if ( document.all ) {
        return document.all[ id ];
    }
    else if ( document.getElementById ) {
        return document.getElementById( id );
    }
}

function activateBullet( idcat )
{
    img = DOMCall( "img" + idcat );
    img.src = "upload/bilder/balken_weiss.gif";
}
function deactivateBullet( idcat )
{
    img = DOMCall( "img" + idcat );
    img.src = "upload/bilder/balken_grau.gif";
}