///// CONFIGURATION VARIABLES:

var name                = "#rightsidebar";
var menu_top_limit      = 241;
var menu_top_margin     = 20;
var menu_shift_duration = 500;
var menuYloc = null;
///////////////////////////////////

$(window).scroll(function()
{
    // Calculate the top offset, adding a limit
    offset = menuYloc + $(document).scrollTop() + menu_top_margin;

    // Limit the offset to 241 pixels...
    // This keeps the menu out of our header area:
    if(offset < menu_top_limit)
        offset = menu_top_limit;

    // Give it the PX for pixels:
    offset += "px";

    // Animate:
    $(name).animate({top:offset},{duration:menu_shift_duration,queue:false});
});