function slideUp()
{
    var slider_div = get_slider_div(); 
    var slider_pos = get_div_position(slider_div);
    
    var slider_height = slider_div.height();    

    if (slider_pos%144 == 0 && (slider_pos+slider_height) > 576)
    {
        $("a#down").removeClass("nomore");
        slider_pos -= 144;
        slide_div(slider_pos, slider_div);
    }
    
    if ((slider_pos+slider_height) <= 576)
        $("a#up").addClass("nomore");
}

function get_slider_div()
{
    return $("div#slide_bar");
}

function slideDown()
{
    var slider_div = get_slider_div();
    var slider_pos = get_div_position(slider_div);
    
    if (slider_pos%144 == 0 && slider_pos < 0 )    
    {
        $("a#up").removeClass("nomore");
        slider_pos += 144;
        slide_div(slider_pos, slider_div);
    }
    
    if (slider_pos >= 0)
        $("a#down").addClass("nomore");    
}

function slide_div(slide_x, slider_div)
{
    slider_div.animate({top:slide_x+"px"}, 400);
}

function get_div_position(slider_div)
{
return parseInt(slider_div.css("top")); 
}

        //slider_div.stop().css("top", slider_pos+(144-(slider_pos%144)));
        
        //slider_pos = get_div_position(slider_div);
        //slider_pos += 144;
        //slider_div.stop().css("top",slider_pos+"px");
        //alert("cur pos:"+slider_pos+"\ndivision:"+(slider_pos%144)+"\nmust slide:"+(slider_pos+(144-(slider_pos%144)))+"\nnew_start_pos:"+slider_pos);