$(window).scroll(function(){
    if  ($(window).scrollTop() >= 229){ //looking for the window to scroll to 229px in this example
         $('#navigation_table').css({position:'fixed',top:0,left:'50%',margin:'0 0 0 -487.5px'});
    } else {
         $('#navigation_table').css({position:'relative'});
        }
});

Change Div Positioning to Fixed at a Specific Scroll Point - Some code from mjnestor - Forrst

JavaScript