function changeText ( obj, text ) {
    obj.innerHTML = text;
}

function changeBgImage ( obj, url ) {
    obj.style.backgroundImage= 'url(' + url + ')';
}

function topicPathOnMouse ( obj, text ) {
    changeText( obj, text );
    changeBgImage( obj, 'http://weeeblog.net/common/images/icon-dot.gif' );
}

function topicPathMouseOut ( obj ) {
    changeText( obj, ' ' );
    changeBgImage( obj, 'http://weeeblog.net/common/images/icon-dot-gray.gif' );
}