$(function() {
    var tableMenu = document.getElementById("tablenav");
    if (tableMenu!=null)
    for(j=0;j<tableMenu.rows[0].cells.length;j++) {
        var sfEls = tableMenu.rows[0].cells[j].getElementsByTagName("LI");
        for (var i=0; i<sfEls.length; i++) {
            sfEls[i].onmouseover=function() { this.className='sfhover'; }
            sfEls[i].onmouseout=function() { this.className=''; }
        }
    }
});